hmm odd my freind had the same thing as you in a 55g fowler I suggested the same to him and after 2 weeks no more diatoms and he has alot of sand to cover, the reason why I suggested this fish is for 2 reasons 1 to keep the sand be stirred releasing particles into the water so it can be skimmed out and also to feed the corals, second there is pieces of food that don't get eaten and land on the sand bed this fish will eat it and keep the sand nice and clean. Maybe you got a lazy or cyanide caught fish anyhow if you try another one make sure it's sifting sand and eating to increase your luck.
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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