Hi guys i'm new to this forum and new to fish keeping , I started just before christmas (2013) with a Fluval Roma 125, I'm getting on not too bad , Just today I was in my local fishkeeper store and I was admiring the coral display in a marine set up and it set me wondering if coral rock can be put into a tropical setup and if it can would the coral live or would it just be decorative ( either is fine). I just want to know if it's safe to put it into an aquarium which already has fish in it?