Quote Originally Posted by UncleChester View Post
A low temp hot glue gun works great for styrofoam, no long cure time or bad smells unless you happen to melt the styrofoam (then it's awful and something you should run away from). This takes some effort with a low temp gun and the solid insulation type of foam, like pressing the tip up against the foam for a few seconds. The lack of a curing time may work against you if you want time to re-position things. Either way, it can be used to 'tack' pieces in place if you plan on siliconing.

I may have missed it, but what are covering the background with?
I believe we don't have a hot glue gun, so I'll just pick up some aquarium-safe silicone from the store.
And I'm not sure what I'm covering it with yet. I was first trying to figure out what to use lol!