Add the clean up crew when your cycle is 100% completed, and not before. Inverts don't like ammonia.
I just ordered from etropicals.com and the Build-Your-Own (BYO) cleanup crew package. If you order over $60 they don't charge to ship. Check them out.
I like astrea snails, they love to eat on the rocks and the glass, and not to mention they'll munch at cyano
, which is always a plus. I'd get atleast 40-50 for your 120.
Cerith snails are a nice addition, they like to dig a little in the sand and also the glass/rocks. Maybe like 20 of them.
Nassarius snails are sand burrowers, and will do a good job sifting your sandbed. I'd say atleast 10 if not more
I dislike hermits, and IMO
snails can do just as good a job as they can.
Those are just some suggestions.
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