How to repair a crack in your aquaponics fish tank

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How to repair a crack in your aquaponics fish tank
2/24/2014 1:41:24 AM

That special thing happened that as a fish tank owner you never want to have happen.  Especially if your fish tank is in the house.  The bottom of the tank developed a small crack over time.  And a persistent drip drip drip leak started to puddle all over our floor.  Let’s fix that real quick shall we?


I thought that the Rubbermaid series of “tanks” as we texans like to call them were pretty tough.  As it turns out they need to be sitting on a large flat surface with zero variance in order to be able to support they weight of 300 gallons.  I had the tank sitting on a series of bricks but not enough bricks to truly support the bottom of the tank.

First order of business is to capture and transport the fish to a smaller holding tank so that we can clean and patch the larger tank.  I had the kids bring in one of the 150 gallon stock tanks from the field.  Then we relocated some of the existing water.  Then we moved the baby fish in their net tank.  And then the large fish were moved over.


Here you can see that we have an exposed cement floor in the room that the big fish tank was in.  Getting it emptied and relocated made an even bigger mess in that room


Once we got the tank outside we scrubbed it out and let it dry.


Oddly enough, we are still growing veggies in our grow beds.  We haven’t had the pump on for a couple of months now due to the cold (save the fish!!!).


Here you can see one of the three cracks that had started.


I found a water proof marine grade epoxy specifically for repairing fish tanks.  The nice thing about this two part epoxy is that it comes in a self portioning ejector.  Squirt a little out and mix it up with a putty knife.  No need to measure the ingredients.


Then squish the epoxy into the cracks with the putty knife.  And let it dry for a few hours.  For cracks like these you could potentially clean the crack with the water in the tank, mix it, and squish into the crack under water.  I haven’t tested that theory though.


I will let you know how well this works once I get the tank set back up.

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