Hi, what a great setup u have, so lovely. I can see a lot of larvae floating. It quite strange if u said it only breed at 72 degree. In SG here, I can only achieve 72 degree in aircon room. For my opinion water parameter is the main factor for them to breed, I did adjust my tank pH value up by adding coral chips to achieve 8.0 and bought myself a refractometer to up & maintain the salinity to 1.015. By then I realize one of my opae ula got berried. I might be wrong in this but that was what I did. But what I can see from your setup & the amount of larvae floating, your tank water parameter is very good then. Thanks for sharing the pics & info on your setup : )
Welcome to the forum!
That's great that you can get the opae to breed at 30 degrees C. For me either they would not breed at all or when a few would the babies would disappear after a day or two. All the water papameters were fine and I even separated the babies to another tank by themselves. Next day I would find them on the bottom dead. Now that the temps are down here in California 65-72 degrees I finding no issues at all.