If your setting up a breeder tank,I would remove the LR and just have a terracotta pot in there.Let algae grow on all sides of the tank apart from the front,raise temp to 80,make sure there is plenty of food in there and lower salinity to 1.020.This fools the fish into thinking it is spring time(breeding time) and there is plenty of food for thr fry.if you dont move the rock out you'll have trouble catching/removing the fry unless your willing to stay up very late on night 8