CP will suppress diet. I would do bigger water changes if there is a lot of uneaten food. Remember to dose the water change water with CP to replace what you take out.
What @Enderturtle said. No need in using a fish to cycle. Besides you run the risk of killing the fish anyways.
I've have alot of success in my previous tanks just throwing in a dead shrimp (raw) from the local store, letting it decompose, remove, and just pouring the whole bottle of biospira in. Only takes a week or so to cycle.
You guessed it -- running out of room up top. I've got my DJ power strip up there and the cords coming in from the rear are pretty close to the skimmer so I want to keep height the same.If you don't want to cut the baffles you can raise the skimmer instead if there's room.
I stopped by Albany Aquarium today to ask about snails. They have black foot Trochus snails. I spoke with Hector and he filled me in on them a bit (demonstrated how they can self right) and explained he personally didn't mix them with hermits. They'll take the hermits back with credit towards the snails so probably going to do that next weekend (after doing some more research).
I actually asked about extra shells but the saltwater/reef guy was out so wasn't sure if they kept extras on hand. I have one spare now with the sad death of the scarlet legged hermit but I think it's way too big for the blue legged crabs.Not bad advice.
But an alternative is to buy a bunch of empty shells for the hermits.
The theory is that hermits normally do not directly attack snails if decently fed, unless they badly need
a larger shell to live in.