I'm getting ready to set up a 55 Gal tank, I'm not exactly sure what I'm going to put in it yet, but I do want to have a few plants. Instead of buying gravel at the fish shop b/c its so expensive I decided to just spend a couple of bucks on some pea gravel. Well I wanted something darker than what they had and I ran across this crushed trap rock. Its smaller and more angular than gravel, do you see any problems with using it? Any opinions are appriciated.