My three BTAs chose locations in my 180 with the brightest light and the strongest flow. PAR around 150 for two hours, followed by PAR around 300 for four hours, followed by PAR around 150 for another two hours (theyââ"šÂ¬Ã¢"žÂ¢ve all parked between pairs of 250-watt PFO Minis so they get light from one or both at various times throughout the day). Flow is driven by three 6100 Tunze Streams, on a multicontroller in ââ"šÂ¬Ã…"œsequential modeââ"šÂ¬Ã‚Â. Peak flow is over 10,000 gph (including the 1000 gph sump return pump).
I feed them a few chunks of silverside or krill twice a week.
I donââ"šÂ¬Ã¢"žÂ¢t think youââ"šÂ¬Ã¢"žÂ¢ll have any problems with BTAs in a bare-bottom, high flow and brightly lit tank. Just provide them with plenty of secure crevices in the rocks where they can plant their foot.
BTW, I hope your PAR is greater than 100. Thatââ"šÂ¬Ã¢"žÂ¢s pretty dim light for metal halide. Even in the bottom, far corners of my 180, the PAR runs about 200.