Yeah like he said its because of the three month thing. For some reason and nobody really knows you have to wait longer
I added SPS to a brand new system, dry rock and a seeded foam filter, no issues at all. I don't agree that it's a "new tank" issue.
Issues to bleach could be something with lighting, very high PO4, something in the water that can't be tested for. I'd suggest lack of filtration, but you have fish and non SPS, so not likely that. You don't mention temp, is it high/low, large swings?
Everyone I know who has a sols has had problems. Most of the time it is not enough light, especially if you have 120 degree optics. Borrow a par meter. How high are your lights? I don't think a 4 or 5 month old tank will kill sps like this because it's not "stable". Use a hanna uln phosphate checker, salifert used to read 0 but it ended up being .2 in my tank :hmm5:
Sorry to hear that.
Are you feeding them anything? SPS need food in the water, either from a crap ton (pun) of fish or you sprinkling in coral food on a regular basis.
Newer tanks are so clean and sterile that it's tough IMO. Giving the SPS enough food to remain healthy will increase algae issues since the tank is new as well.