02-25-2008, 02:32 PM
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Originally Posted by fish_4_all
The concrete I would use is anything that is rated for water systems.
As for coating it with sand, silicone would work fine to do and would seal the styrofoam at the same time if you coated it completely. The only worry owuld be if the silicone ate away the styro.
As for sealing it, marine expoxy will probably work best. For keeping the fish out from behind it, silicone it to the back of the tank.
No i was wanting to concrete it then use a paint brush to spread silicone over it all then spread blue hobby sand over that. But iono if the hobby sand would be toxic or not?