Have you tried some chaeto on reverse schedule lighting? Don't know how to determine how much chaeto it would take.
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@Skibi If you go Yellow Canary Wrasse check out the tank-raised ones at Blue Zoo Aquatics. Although they are wild bred they are caught as juveniles and tank raised for quite some time in captivity. It is a process and time frame that goes well past quarantine. They are quite a bit more hardy at this point than the ones just plucked from the ocean. I think they would worth the extra money. They say you get what you pay for and that includes hardiness.If I had to recommend a wrasse I would say never buy a six line... get a pink streaked wrasse stays small and not aggressive. Also leopards are awesome and peaceful in my experience. If you do go the coris wrasse route say a yellow or melenarus, expect them to get possibly too aggressive and big for your tank, but when they are small they are great usually as they are awesome pest killers flat worms, nudi's etc