Bawb2u;3509204; said:Silicon won't stick to a wet surface. Is it leaking around a bulkhead or a seam? If it's a bulkhead try tightening it. If it's a seam, either drain the tank and reseal it or prepare for a possible flood.
If it's between the burger and the buns you need more ketchup.

No easy way out. I`d be looking for a good place to house your fish, while you fix the tank.
1 or 2 plastic tubs should do.
that is why we call it wet world.