So I got a great aquacultured maxima from neptune last weekend, Robert had some awesome ones. Anyway, I put it in my tank and immediately opened up big (I turned the vortechs to a minimum). Quick reaction time and everything. Then I turned the flow back on, and nowhere I put the clam allowed his mantel to not flap around like crazy. I'm pushing about 7500gph through the display (48x20x20), and lots of open space. The clam yesterday moved below some rocks in the shade, lower flow, but no light. The mantel won't extend past the shell edge now. So then I gently pulled it (byssal threads were hanging onto the glass) and put it up behind some rocks to see if that would help, but even retracted so that the mantel doesn't go over the edge, I could still see some flapping. I'm thinking there is just too much flow going on for the clam. I like it because the corals are fat, and there's nothing left on my barebottom. I also really like watching hermit crabs tumble around when they lose grasp on the rock. So either: 1. The clam is just sick and dying for some reason 2. The flow is too high? I have a continuous water change that keeps nitrates really low (4.5 gallons a day is changed out with a total of like 110 gallons of water in the system). So the water params are spot on. Anyway, never owned a clam before, I thought given enough Ca, light, and good enough params for touchy SPS, it would do... but maybe the flow is destroying it?