I've tried the powerhead myself and some of my btas seem to just LOVE that and willingly stay. I've had to just rearrange or shade the area by other rocks or black acrylic and then the bta moves out once it decides it needs more light... just a thought, might work for you if the PH doesn't.
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-Mike (Tank Info / Links / Pics shown below)
120G Reef with 2x250W MH lighting
My old 33G Reef with 192W PC lighting
Live Rock - These tanks have some purchased liverock, but mostly home made live rock
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