My tank is currently fishless as I'm letting it run its parasite cycle before introducing new fish. My question is, in the meantime, do I need to feed my crabs/snails? If so, what do I feed them? I noticed the past few days my crabs have become much more aggressive, and even attacked and killed several snails. I'm now starting to think they simply are hungry, but I'm not sure. BTW, I have plenty of live rock in the aquarium, and my conditions are great overall. Lastly, is there anything else I should do to keep the bacteria levels up in my tank? I've heard that fishless tanks often lose bacteria since they don't have amonia to feed on. Thanks.