One thing I always found was if I had zebra crabs blue legged or what ever and snails the crabs almost always killed some of the snails to get the shells. Next time around I'll be tempted to have a very limited number of crabs but alot of snails. I always found them to be better cleaners than crabs. If you have a large enough tank once it's gone through it's algae bloom phase I'd rather have a fox face or a tang, both would be awesome as long as the tank could handle them.
Doug
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