I had a major aptaisa infestion in my tank- my tank looked like yours. I found the only thing that worked was berghia nudibranchs. I found in order for them to be effective you need at least 2/10gallons. It gets expensive at that ratio, but it worked wonders. It took a few months for them to do the job, but now, I only ever see the odd one in my tank. Once the berghia go into the tank you will most likely never see it again, but they are doing their jobs, sometimes at night you see them come out on the rockwork.
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180 gallon LPS dominated reef
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