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Hi ChrisO , What are you using for phosphate removal ? Quite surprised the tangs aren't interested , maybe cut feeding substantially to force the feeding .
It really does come down to light and nutients. High flow stops detritus from settling, but low flow essentially lets nutrient hot spots build up, so that's back to nutrients again. Reduce these, by reducing feeding, bigger water changes, phosphate removal, etc. Your tests show zero nitrate, but mainly high levels of phosphate, so I'd concentrate on that first. No lighting, will kill algae - Photosynthesis can't happen without light. Did you have any light getting into the tank at all? A blackout should be all sides and top covered, and no lights on.
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