Make sure you save some of the tanks bioload capacity for fish other than scavengers and algae eaters
You been studying up on your basic water chimistry skills?
As mentioned. make sure you have some algae wafers, cucumbers and zucunni to feed all those fella's after they reid the tank of all the algae, or you'll have another problem on your hands.
Dingy water and an Amon spike from all the decaying algae eaters that were starved to death.