I setup a new tank about 2 months ago. I got black gravel from Petco. I've noticed that the coloring has started to come off the gravel and I want to get rid of it ASAP. Never going to buy anything with the name "Petco" on it again. I've ordered Caribsea Sand that I want to put in place of the gravel. What is the easiest and safest way to do this? 46 gallon bowfront tank. 2 inhabitants at the moment. Growout for a Red Texas and Red Dragon Flowerhorn. I do have biospira on hand if needed.