over the past month my crocea has moved closer and closer to the rocks edge..i have him on the top of the tank. will he know to stop if he's moving too close?

and i dont wanna hurt him by moving him when he has his filaments attached

I think the byssal threads will keep him from falling.

yeah those suckers grab on tight....

yeah... i have one that is pretty much vertical off a rock and holding steady

well last night before i went to bed, i found my clam on the sand and i put him back on the rocks and this morning i found him in the sand again..i hope he stays put this time

LOL. sometimes it can take awhile for them to get comfy. My crocea took me a couple of days to find it a spot on the rocks that it didn't fall off of. My maxima has almost moved itself vertical in hanging off the rock.