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Hurricane Checklist

|   Always Remember That Everyone's Aquarium is Different with Respect to Stocking Load, Cleanliness, and Power Requirements. As a Result, There is No “one-size-fits-all” Solution. Your Best Course of Action For…

Always remember that everyone's aquarium is different with respect to stocking load, cleanliness, and power requirements. As a result, there is no “one-size-fits-all” solution. Your best course of action for any kind of power outage or damage during hurricane season is to plan ahead.

First and foremost, ensure that you and your family are prepared and safe before worrying about your fish!

Before The Storm

  • Print out this guide so you have a copy of it. You may not have Internet access to review it later.
  • Cut back on your feeding – less waste means less oxygen demand (amount of oxygen being used by the aquarium ecosystem)
  • Stop feeding 24 hours prior to the storm arrival – this allows the fish to fully digest what is in their system prior to the power outage and reduces oxygen demand by bacteria.
  • Do a partial water change 36-48 hours prior to the storm – clean out as much debris as possible to reduce oxygen demand. This includes changing replaceable filter pads.

Battery Backup Systems, Generators, and Battery Operated Pumps

  • Computer battery backup systems typically will only keep an aquarium running for 20 minutes up to a couple hours. The power drain from your main pumps is very similar to the power drain of a computer that is being used (not sitting idle). This system is usable for short duration, but is really impractical if we are expecting a major storm and you want to run the whole filter system. However, a battery backup system will run a small, air pump for many hours. Consider using a small, low watt air pump(1.5 – 2 watts is all that is needed).
  • Battery operated air pumps like the Penn-Plax Silent Air B11 are great to always have on-hand, but the batteries will not last more than 4 hours during a lengthy power outage.
  • Generators can be used, but only if you have a very good surge suppressor in line with your pump. Most of the pumps we use are electromagnetic actuated mechanisms. That means the power is transferred through an electromagnet to turn impellers or to move a diaphragm. Electromagnets depend on very clean stable electricity, something very few generators produce (unless the generator incorporates electronics to smooth the power). The best solution if you have a generator is to put a good surge suppressor (computer type) in-line between the generator and the aquarium. If you have a generator make sure you test your aquarium pumps prior to the power failure to make sure it will work. It may take more than one surge suppressor to clean up the power from a generator before it is usable.

The Power has Failed – What Can You Do?

Most aquariums will be fine for ~24 hours (depending on oxygen load) if the fish are left alone in the dark. The following are steps to take to ensure the survival of your aquatic friends.

  • Leave the fish alone; cover them to make the tank dark. The more you disturb your animals, the more oxygen they will use. If they are in the dark, they will rest and use less oxygen.
  • Heat is a big concern in Florida during hurricane season. Most freshwater tropical fish will be fine. If the animals are in the dark, heat will have less of an effect on the overall system. The key is to keep the animals in a reduced respiration state (dark and quiet) so that their systems can temporarily combat the heat.
    • Wrapping an aquarium with blankets can help temporarily, but the thermal loads will overcome most insulating wrapping in several hours.
    • Optionally, a DIY air conditioning unit will not only help you and your family stay cool, but it will also help maintain the ambient temperature in the room your aquarium is in. We recommend creating your own blocks of ice and storing them in a heavily-insulated ice chest like the Coleman Xtreme cooler, which will keep ice frozen for five (5) days. Blocks of ice have less surface area than its equivalent in cubed ice, thus will stay frozen longer.
    • Do not add ice directly to the aquarium, as this will only cause stress on the animals with the drastic temperature fluctuations.
  • Check the animals every 4-8 hours and observe the inhabitants for signs of oxygen distress.
    • Oxygen distress is shown by the fish when they start to hover near the surface with their mouths right near the surface of the water – they are trying to get oxygen from the surface film (where oxygen is diffusing into the aquarium).
    • Be very quite when observing the fish – you do not want to raise their metabolism, or scare them to where you cannot observe the oxygen distress behavior.
  • If you observe oxygen distress behavior, you need to re-oxygenate the aquarium using the water dumping method. Stirring the aquarium with a giant spoon will do nothing but excite the fish and increase oxygen demand.
    • Open the top of the aquarium and/or remove the glass tops.
    • Take a pitcher or sizable container (make sure it is clean), scoop up some aquarium water and poor it back into the aquarium from a height of 2-2.5 feet. This will disrupt the surface helping to re-oxygenate the water, while mixing the tank thoroughly. Repeat this continually for about five minutes. This should bring the aquarium back to near the oxygen saturation point.
    • Check the fish every few hours to see if you need to repeat the re-oxygenation procedure.
    • Over time you may find that the periods between the need to re-oxygenate the aquarium start to decrease (get shorter between signs of distress). This indicates that the oxygen demand (amount of oxygen being used) is increasing due to increased animal or bacterial respiration.
  • What do you do if re-oxygenating becomes to frequent or simply cannot be preformed (have to leave)?
    • You can use hydrogen peroxide to re-oxygenate an aquarium – This is a risky procedure and should only be done if absolutely necessary! Use the water dumping method first! Only if you are actually in the process of loosing animals, or the loss of animals is emanate, should you perform this step. Improper use or overdosing will kill animals, coral, anemones, bacteria, and anything else living in the aquarium.
    • You need to know the volume of your aquarium, and the approximate displacement by decorations, rocks, etc. It is absolutely critical that you do not overdose the aquarium! Doing so will result in oxygen levels skyrocketing past saturation (super saturation), potentially causing serious harm or death to the inhabitants of your aquarium. Corals and anemones are especially sensitive to super saturation. Overdosing can lead to gas bubble disease and oxidation of gill, fin, and skin tissues (similar in effect to an acid or alkali burn on humans).
      • The Central Florida Aquarium Society does not make it a practice of providing this information, as every aquarium is unique, and dosages can vary. In light of the possible hurricane strike we thought it best to provide our community members the tools necessary to survive an extended power outage. We are not responsible in any way for any loss incurred by using the following dosages as we do not know the actual loads or oxygen demand on your system. Please be very careful doing this and start with low dosages before attempting a full dosage.
      • Proper dosage is 1 teaspoon of standard grocery/pharmacy grade hydrogen peroxide per each ten physical gallons of water in a properly maintained low oxygen demand system. There are technical ways to measure the oxygen demand, but they are beyond the abilities of almost all home aquarists (requires lab equipment). What this means before you start dosing:
        • Notes on how to best determine your oxygen demand:
          • Big Freshwater: If you have a 75 gallon aquarium (only really holds ~72 gallons of water) with 25 approx 3″ African Cichlids and you do regular water changes monthly, and only feed what the fish need, you would most likely have a low to moderate oxygen demand. Do not include the volume of sumps as they are not working during a power failure. You put ~75 lbs of gravel in the aquarium and 50 pound of rock and decor, you probably displaced 5-10 more gallons of water. This means you are dosing for a maximum of 62 gallons – always error on the conservative side and overestimate displacement!
          • Small Freshwater: If you have a 15 gallon aquarium (only really hold ~13 gallons of water) with 15 approx 1″ Community fish and you do regular water changes (monthly) and only feed what the fish need, you would most likely have a low to moderate oxygen demand. You put ~15 lbs of gravel in the aquarium and 10 pound of rock and decor, so you probably displaced 2-3 more gallons of water. This means you are dosing for a maximum of 10 gallons – always error on the conservative side!
          • Saltwater: Saltwater holds less oxygen so you are working at a deficit to start with. Look at your total tank volume – do not include sumps as they are not working during a power failure. In reef and fish tanks, you will have to do a best guess on the amount of water your live rock and decor displaced – it is better to over estimate displacement (this will lower the total dose) – be careful! Dosage is the same 1 teaspoon per 10 gallons in a well maintained aquarium.
        • It is very difficult to estimate the oxygen demand for your aquarium, so error on the safe side and start with a ½ dosage in a well maintained aquarium. Start with a ¼ dosage in an aquarium that has not been properly maintained.
        • To dose the aquarium, use regular hydrogen peroxide from the grocery or pharmacy (you may have this in your medical supplies already). You will have to best guess your dosage based on tank volume on oxygen demand. We recommend starting with ¼ – ½ dosage (1 teaspoon per 40 gallons= ¼ dose), then increase the dose if necessary by stepping up the dosage over treatments. Do not start with a full dose unless you really know what you are doing!
          • Start by aerating the aquarium using the water dump method for a minute to two minutes.
          • Add your hydrogen peroxide to a pitcher full of water. Dump the mixture from 2-3 feet above the aquarium as you were doing before.
          • Continue dump aerating for two more minutes to completely mix the oxygenated water throughout the aquarium. You do not want pockets of supersaturated water.
        • If you are dosing properly you should get oxygen saturation and won’t need to re-dose or water dump aerate for ~12 hours.
        • If you overdose, the animals will start to dart about due to supersaturated oxygen levels. If this happens, immediately aerate using the water dump method until the animals stop showing distress.
        • If you started with a reduced dosage and notice that the animals show signs of oxygen depletion within a few hours, increase the next dosage by about 10%. Step the dosages up this way until you find a comfortable stable dose.
  • Before Power has Returned
    • Canister and Other Sealed Filters: What to do before the power comes back on if you have a canister filter.
      • If you have a canister filter, you need to empty it if the power is off for more than 24 hours.
      • Water will become anoxic (no oxygen) in a sealed canister resulting in hydrogen sulfide and other pollutant buildups. When the power comes back on, these products of an oxygen starved environment will be pumped into the aquarium and potentially kill your animals.
      • Empty and rinse (as best as possible) any Canister filter that has been down for more than 24 hours.
  • When Power Returns
    • Make sure your filters are working properly.
    • Remove any inhabitants that might not have survived.
    • Test your water primarily for Ammonia and Nitrite.
    • Perform a partial water change if the test results indicate the need. Do not over react! If you are simply reading trace amounts of ammonia or nitrite do not panic! Wait a day and test again. Overreaction can cause more harm – Let your aquarium stabilize.
  • Your aquariums ecosystem has just gone through a major stress, give it time to stabilize naturally if possible. If you overreact and start treating with a lot of chemicals, you can very easily destabilize the environment even more. Be patient.
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