Clean up crew?

[sango]

I see everybody talking about a clean up crew, but what is it?? I have a 90 gal and its going thru the cycle now. Would it be a good idea to get a clean up crew after its done befor I ad fish? Or would it be ok to ad the clean up crew to the tank at the same time I put in my fist fish? Thanks in advance

 

[IfoundNemo]

Clean up crew consists snails, hermit crabs, shrimps. It would be very good idea to add the clean up crew right after the cycle process. Let them clean your LR, LS, and the tank. This will give you times to QT the fish before you put them into the main tank. Good Luck!