So i recently aquired a new 40 gallon tank and was planning on making this my summer project. that being said, i want to make a completely unique, heavily planted, custom decor-ed Apisto Community tank. i want to build next to everything (breeding caves, rock fixtures, the works).
with this being said, i found an article on a different website that talks about forming decor out of styrofoam and expanding foam and then coating it in pigmented quickcrete to create custom caves and backgrounds and stuff for an aquarium, I was wondering if this was a safe thing to do in a freshwater tank, as the article is fairly vague on the subject.
here's a link to the article:http://www.diyaquarist.com/archives/278
thanks in advance for the help, if there's a better material/method to building this kind of stuff i'm open to hearing it.