I got some acans about 2 weeks ago or so and they seemed to be happy in the tank (puffed out) but never really ate. I tried cyclopeeze and mysis and they never really took any of it. Well, the last couple days one of the frags has receded a lot and hasn't looked happy in the least. Today, another one of the three has started this process. I'm left wondering what could be going on. My candy cane coral has also deflated completely over the last couple days and you can tell it was happy as the one head has 5 mouths on it (I got it with 1 on that head). The guy I ordered the acans from also gave me some zoas which seemed happy but also have shrunken even though they're relatively close to my other zoas which are mostly out. ammonia - 0 nitrite - 0 nitrate - 0-5 pH - 8.3 alk - 9dKh calcium - 440 temp - 78 The only thing I can think is I regenerated my Purigen and added it back to the tank about 5-6 days ago and I'm wondering if I didn't get all the bleach out. It was rather spent when I took it out, soaked it over night in 1:1 bleach:RODI, then soaked it a day in RODI+Prime. I don't think the addition of Prime to the tank would've done this, but I can't think of much else that would do this. Perhaps if the new Purigen sucked out a bunch of something the acan liked that spike could've caused something? I do have them under LED lighting, and reduced the photoperiod by 2 hours for today. The actinics should be on for 10 hours today, with whites on for 8. I also noticed the analog timers we were using seemed to have some of the buttons pressed in a ways (not completely, but perhaps enough) to possibly kick on some lights over night so I reset that portion. They're near the bottom of the tank and out of the majority of flow. Any other ideas? Here's the worst one: 10ish days ago: Next acan that's decided it doesn't like life (today/yesterday): 10ish days ago: This is two acan colonies (bottom right is the "best" right now) and the candy cane. 10ish days ago: Blastomussa merletti loving life... Brain Coral... Even the RBTA I did mount them to rock about a week ago (3-4 days before the recession) and some of that was base rock so perhaps a spike in phosphate? The tank got cloudy and everything seemed to shrink up for 10-20 minutes until it cleared and then almost everything popped back out (the RBTA got mad and pouted under a rock for the night).