About half of my zoa's have either melted away or something is eating them. I noticed first sign of this maybe a month or so ago with one colony and didn't think much of it. Everything was looking fine for a while but looking at my tank last night I noticed also a huge orange zoa colony is almost completely wiped out, along with some of my rastas, and a plug that was completely covered with green zoas now just has a couple along the edge.
Being halloween and all last night I didn't have much time to do anything such as tests. I did however test maybe 3 weeks ago and everything checked out normal (alk was a little low but it's always been low in my tank).
I have made some additions / changes to my tank a little over a month ago and suspect one of these is the culprit.
1. Added biowheel hob filter and started running carbon. I haven't changed the blue carbon filters yet, maybe its leaching something? Is it making the water too clean?? I read zoa's prefer dirty water..
2. Added to my CUC. Added about 6 hermits, 1 emerald crab, and a skunk shrimp. I havent witnessed any of them picking at corals, but my guess is they do it at night if they are doing it...
3. My last water change was done with a new box of salt mix. Perhaps something is off in the new batch? Using Reef Crystals (same brand I've always used). Should I test the fresh batch? If yes, what should I test for?
4. Replaced my bulbs. I have a 6 bulb T5 Reef Elite fixture. I would replace two of the bulbs at a time over a month period. Note that I replaced with same types of bulbs, no new color spectrum or anything..
TIA to anyone that can offer advice!
Being halloween and all last night I didn't have much time to do anything such as tests. I did however test maybe 3 weeks ago and everything checked out normal (alk was a little low but it's always been low in my tank).
I have made some additions / changes to my tank a little over a month ago and suspect one of these is the culprit.
1. Added biowheel hob filter and started running carbon. I haven't changed the blue carbon filters yet, maybe its leaching something? Is it making the water too clean?? I read zoa's prefer dirty water..
2. Added to my CUC. Added about 6 hermits, 1 emerald crab, and a skunk shrimp. I havent witnessed any of them picking at corals, but my guess is they do it at night if they are doing it...
3. My last water change was done with a new box of salt mix. Perhaps something is off in the new batch? Using Reef Crystals (same brand I've always used). Should I test the fresh batch? If yes, what should I test for?
4. Replaced my bulbs. I have a 6 bulb T5 Reef Elite fixture. I would replace two of the bulbs at a time over a month period. Note that I replaced with same types of bulbs, no new color spectrum or anything..
TIA to anyone that can offer advice!