Hmmm my poor butterfly and trigger. I'm not really tang crazy and i knew my trigger was likely to be incompatible.........what else is going to be a big swimmer to flesh out the open aquascape? Do you have any recent shots of your tank here with the rays or video? My tank has overflow on one end I intended to hide it with rockwork and possible pillarish structure on the opposite end as well. Do you think 30 wide is enough for an adult size specimen. Otherwise it will be 3 rock structures and a zebra moray. Current stocklist is harlequin tusk, racoon butterfly, niger trigger, midas blenny, flame angel, regal tang, 2 sets of clowns, and a group of chromis. Removing the butterfly and trigger, what could i replace thier activity and color with?