I have tried everthing i can do, i have dragon skin acans,rainbows,and so on.all my acans are next to eachother and some do awsome and others i have sent to freinds to take care of.. They do recover but when i get them back they recied faster than i can do waterchanges/weekly. Iam sick and tierd trying to figure out whats wrong.. these are one of my favorite corals.. But i have no sucess with the high end /rainbows. every other coral including chalices,zoas,sps,lobos, zoa's,and normal acans meaning red,green,purple,and orange do well..i guess the next step is to hate the rainbows and than i might have sukcess....i even hade the fish store check my water to see if my test kits are off. but every thing comes back normal..i guess iam done with acans and that really hurts..if someone knows a trick let me know?? thanks and good luck to all....