60 gallon (previously 45) cube updated on 8/19/2010

[wisesam]

Hmm, it doesn't say it's specific for fresh or salt water..

I read epoxy or fiberglass resin can seal it. But where do I find those?

[wisesam]

Well.. found that cold cure epoxy resin should do the job. Industrial plastic & paints sells it.
I'll be taking the background down to apply a coat of that, then add a piece of glass in the back to make sure the pressure doesn't break it.