Should I add cleaner crew...

after. you don't want to add a clean up crew if there's nothing to clean up. wait till the fish and algae start making a mess and them add them.
 
I added mine a week after the cycle finished, there was already plenty to clean up. I left the fish to the very last thing - which was a month after the clean-up crew went in.
 
My clean up crew just got in, my cycle is over, so far i have in my 20 gallon:

- 2 blue leg hermit
- 2 red leg hermit
- 1 emerald crab
- 3 snails
- and lots and lots of pods !!!!!!!!! (came with live rocks)
- + lots of baby snails evrywhere!

You will get mix opinion on this, i did research before and came up with that idea, of course i had alot to be cleaned.
 
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