HI, I have a 75 gallon tank that has been set up since March 17th. I added 3 reef crabs (one has died--I guess--haven't seen him in weeks) and 1 turbo snail. I have since added 3 chromis fish and they will have been in the tank for 2 weeks on May 17th. My question is--I am planning on adding probabley 2 FP clowns on the 17th or that weekend (if water paremeters are ok) and was wanting to know how much of a cleanup crew do I need now that I am adding fish? I do have brown algae (it is getting better though) and was wondering about how many snails and crabs I need for a 75 gallon. I didn't add that many at first because my tank was new and I didn't want them to starve to death. I don't have much live rock (maybe 10lbs--I know I need more) and I don't want to add too much. I would also like to add 1 or 2 cleaner shrimp but I didn't know if I needed to wait until 2 weeks after I add the second batch of fish or could I add them at the same time? Also, if I only buy one cleaner shrimp at a time will that cause conflict and fighting by not putting them in there at the same time? Also, is a lawnmower blenny good for brown algae and can you get one even if you don't have that much of an algae problem.. will it eat fish food also?---Thanks---