I had a derasa for about 8 weeks, and looked to be doing well until this afternoon after work. I noticed it was receded into its shell, I had to leave to do a few things, I came back a few hours later and its hermit crab/emerald crab food. I did dose very lightly with phyto, I hate adding alot of extra stuff to the water. Im just confused because I figured I see some sort of distress, last night I was thinking to myself that the blue was really starting to pop again. I had it under a Nova Extreme, and recently upgraded to an ATI Sunmodule. It was 10 days ago though. Is it possible to have too much light for a clam, or maybe I shocked it?