Well personally I would stop adding hermits and add more snails. The general rule is 1 cleaner per gallon of water, keep in mind this is for an established system. If your tank is less then a year old chances are you aren't going to need that large of a crew.
I had a 72g tank and I kept about 10-12 hermits and 60+ snails. I'm having to increase that in the new system (120g).