I've only seen adult maculiceps in public aquaria.
Personally, I wouldn't put them in my "impossibly big tang" category which includes dussumieri, mata, vlamingii and the unicorn Nasos. But they do get huge. Some tangs have streamers, too, which can mess with my mind a bit when it comes to Total Length.
Experience with these large tangs, or at least watching them in person, should be the best guide, imo. If you watch them, they don't swim like the tangs we commonly keep. Zebrasoma and Ctenochaetus spend time picking at the rocks and glass, while the "huge" tangs spend most of their time cruising in the open water.
Sorry, I'm rambling a bit, too. I like discussing tangs....Good luck with your decision. It sounds like you are shying away from A. maculiceps, but there are lots of uncommon tangs that would be fine in a 240. Tennentii might be a good one....or blonde Naso, or chevron, or Atlantic blue.
Personally, I wouldn't put them in my "impossibly big tang" category which includes dussumieri, mata, vlamingii and the unicorn Nasos. But they do get huge. Some tangs have streamers, too, which can mess with my mind a bit when it comes to Total Length.
Experience with these large tangs, or at least watching them in person, should be the best guide, imo. If you watch them, they don't swim like the tangs we commonly keep. Zebrasoma and Ctenochaetus spend time picking at the rocks and glass, while the "huge" tangs spend most of their time cruising in the open water.
Sorry, I'm rambling a bit, too. I like discussing tangs....Good luck with your decision. It sounds like you are shying away from A. maculiceps, but there are lots of uncommon tangs that would be fine in a 240. Tennentii might be a good one....or blonde Naso, or chevron, or Atlantic blue.