How to fix a Leaking Fish Tank

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Keep your fish safe and the floor dry by repairing tank leaks quickly.
Keep your fish safe and the floor dry by repairing tank leaks quickly. (Image: Jupiterimages/Photos.com/Getty Images)

A leak in a fish tank can be a messy – and for the aquatic residents, life-threatening – issue. For a small or inexpensive tank, it is usually a good idea to simply replace the whole tank. However, if you have a large, expensive or specialized tank, replacement can be difficult. In that case, move the fish into a safe, temporary residence and repair the leak using silicone sealant. Always make sure that the sealant is marked nontoxic or pet-safe before using it on the inside or outside of a fish tank.

Things You'll Need

  • Grease pencil
  • Paper towels
  • Razor blade
  • Acetone (or nail polish remover with acetone)
  • Nontoxic silicone sealant

Locate the area of the tank, usually on a seam between glass panels, which is leaking. Circle it with the grease pencil.

Pour out the water from the tank

Dry the area around the leak with a paper towel.

Remove any old silicone or sealant along the leaking seam using the razor blade. Dispose of old sealant pieces.

Pour a small amount of acetone or nail polish remover on a paper towel and clean the leaking area on the outside and inside of the tank.

Squeeze a thin line of silicone sealant along the leak, on the inside and outside of the tank. Make good contact with the surfaces.

Allow the silicone to cure to 24 hours before refilling the tank and replacing your fish.

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References

  • How to Fix Everything for Dummies; Gary Hedstrom, Judy Tremore; 2005
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