I don't know why, but I purchased a beautiful Monty. It was about 6 inches wide by 3 inches. And it didn't last a week. most all my other corals are doing good, except my leather won't sprout. I know my nitrates are a little high, probably like 30, and my phosphate are at .08. Is .08 too high of a level to maintain SPS corals? Otherwise I don't know why my Monty died. my tank is only eight months old. Perhaps the stability is just not there, but I'm not able to find any particular parameter that fluctuates to greatly except perhaps nitrates. I passed the ugly stage. And I had up until a couple weeks ago a big issue with red cyano. But then I put in a refugium in my sump and I no longer have cyano so at eight months I should have a stable enough tank for SPS. IDK what's going on. How long does it really take a 50 gallon system to become stable and mature for Sps? ? I would think since I have Coraline and I no longer have a micro algae issue I should be good to go. But then I do know that I have high nitrates. @30.