I have had an established 150 gallon tank for about 3 months now. Whenever I put SPS frags, even montiporas they start strong and then die within a few weeks. My water chem is good although trates are starting to creep, although still low.
My guess is that it is from the water I am adding to replace evaporation. Phosphate is low and i keep ph/temp stabile during once a week water changes. Any suggestions would be welcome. I klnow it could be anything.