Does anyone use black sand? does it make your fish really pop or does it darken them? what is a good kind to use? What is the best price wise? any advice would be helpful. I am using Monteray Beach Sand from Home Depot right now mixed with some crushed corral with large river rocks, i am not really liking it very much. What i want to do it switch to bleeched Texas Holy rock with black sand. Has anyone seen this done? does it look good?