I use polyurethan coat in all my tanks without problems. Polyurethan coat canbe toxic at the beginning so you have to build your background few weeks before to install the frogs...
No, the Minwax stuff just won't hold up. There are lots of different polys out there. The stuff he was useing is a moisture cure poly designed for coating koi ponds, and I haven't been able to find it in the US.
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