I've got over 100 cherry shrimp in my 29 gallon. The tank was used for ACF's until I moved them to my 55. Totally cycled, everybody's doing fine, but I would loooove to get rid of the gravel(hard to see them!)and replace with a dark colored sand. Is there "the best" way to do this with the fewest deaths(I've got a gazillion tiny ones, almost impossible to see against the gravel!)or do I just want to wait a little bit to build up my stock a little more and realize I'm going to slaughter a bunch of tiny ones when I do this? Or do I just say the heck with how it looks and keep the gravel?