Seam in class losing integrity

[BonelessEvil]

So far, no water has leaked out. Red Sea has given me a new tank in exchange, but I would still like to think I can keep this one running. Is it okay to squirt silicone into the seam – while inside the water? Will that kill the corals or fish? If I should do something else, what would you suggest, outside of draining it?

 

[Moxtrain]

To do it right you'd have to empty the tank and remove all the silicone and reapply. If you already have the replacement tank i would just concentrate on getting that set up.