Could be that 15 fish in a 150 gallon is a little much. A lot depends on what type of system your trying to keep. FOLR with lots of filtration might work.. A complete SPS, and you will have trouble. I really think time will tell you..
Some people are successful with large bioloads, others go for a lower nutrient system. I have 21 fish in my 500 and I feel it's overcrowded..
Happy Reefing
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