Agreed, having 5 SPS requires just as much tank flow as 20. I have 130 gallon which runs A dart closed loop and a dart return as well as a nano-stream 6055 and I still find myself short on flow. Not saying that's the problem but it's something to think about. SPS corals can usually handle one type of stress but it's the combinations that really show effects. Basically you may be looking at multiple causes.
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