Who Gives A Fish Forums

I've left the skeleton in, but now it's attracting algae.

I have 2 more Acans, one of which is in this pic.

My tank's got a mix of fish - Kole Tang, Hepatus, six line, royal gramma, and a mandarin. For cleanup, I've got red and blue leg crabs.

I'm stumped - one of my Acan's lost its flesh overnight and I have no idea what's going on. No signs of nipping or predation, but when I woke up this morning, its flesh was literally flapping from the skeleton. The only thing that's changed recently is my lighting schedule, but I wouldn't have ...