Sorry about your fish.
As for the flooring...can you just keep it concrete? Paint the floor and then varnish it? Put down a couple of area rugs for warmth? It's cheaper than, God forbid, another tank failure.

As for the flooring...can you just keep it concrete? Paint the floor and then varnish it? Put down a couple of area rugs for warmth? It's cheaper than, God forbid, another tank failure.