slight tank leak

[rossb]

In my big tank I have a 2" brace that runs along the front of the tank. When I set my tank up it was fairly level but after filling it and running it, it is out about 1/16th of an inch (not very much). The rear overflows determine the level of the tank and they are just a wee bit too high, so the combination of these two factors makes the water level just a wee bit too high.

Where the front brace intersects the side brace there is a space...and normal water motion causes a bit of water to spill out and run down the front of the tank. Does anyone know of a safe effective sealant that can be used in a tank to seal a leak without draining the tank and drying the surface off? I have to fill a gap of about 1/8 of an inch.

Thanks ross