What kind of sealant is good for a leaking fish tank?

Answer by  fishrmann (44)

You can use 100% silicone. Just make sure it's 100% silicone with NO mold inhibitors in it. The chemicals and additives used for mold prevention are quite toxic to fish. GE makes a good sealant for this purpose. Go ahead and seal all four corners while you are at it.

Answer by  worker73 (61)

You will need aquarium 100% silicone sealant (DAP has one). Make sure you find out exactly where the leak is coming from by filling the tank up slowly with water, making sure everything is dry first. Mark it using something that can wipe off easily (without chemicals) and dump out the water allowing the tank to dry.

Answer by  Alisa (903)

You need to use any 100% Non toxic sealant. There are some aquarium sealants available in local pet stores, or you can go to the hardware store for some.

Answer by  mrdeleo (69)

Silicone is the best sealant to use on a leaky fish tank. Preparation and allowing the silicone time to dry are most important in making it water tight. I recommend 24hrs.

Answer by  worker7186 (198)

You need to make sure you don't use the wrong kind of sealant. You need a silicone sealant that is 100% non-toxic and you need to let it dry properly.

Answer by  worker8388 (994)

We can DAP sealant, which is 100% aquarium silicone sealant. If the tank is old we should consider it to replace. If leak is minor cut and scrape the portion.