ive also read that zoas close for a few days and then when they reopen they look refreshed its has happened on my 3 polyp lord of the rings frag and the colors looked better after reopening. then i also had a frag that i got where the polyps closed up and got smaller and stated getting brown algae on them i read that it was because they were too close to the light and when i moved them down they opened back up but are still recovering. just some of my own personal experience i hope all turns out well with your colonies