I have a Duncan that I have grown from 4 heads to 28 heads. Well it has been closed (all heads) for 2 days straight. Water parameters are perfect, only change is that my MP 40 has gone out for these two days, so water flow is different but still quite strong as I have a Reeflow Dart pumping the tank. Any ideas as to why or what I could do? MH bulbs were changed at the begining of the month and photo period gradually increased over last 3 weeks to normal 8hrs.
Duncan closed
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