Is this indeed a BTA? Maybe I'm blind, but I don't think you said what type it is? If it's a BTA I've found they like to be tucked away into a deep pocket in a piece of live rock. You could leave your powerheads off all night and just leave the return pump going. He shouldn't get sucked over the overflow. I find they like to move at night. Some just like to move I think. I've had some that never stop wandering and some that don't move even when I move the rock to a different place.
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~ Mindy
SPS fanatic.
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