Hey guys, I'm thinking of doing a 74g African tank, and I want to use some rock from my saltwater tank. It's pretty similar to the holey limestone you guys like, but the problem is is that my cichlid tank will go right next to a saltwater set-up, and I really don't like the idea of the rock work looking identical in both tanks. I was thinking black substrate with black rocks would look kinda cool, so I was wondering if there's any fish-safe/aquarium-safe paint I could use to color the rocks? Thanks guys!