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I have not, that’ll be my last resort since I’ll have to re plumb stuff or get one of the hang ones from BRS. My next system will have one for sure.Sorry if I missed this in a previous post or thread but did you try UV at some point?
Oh I’m sure it does. Looked great after but was a pain during..Personally I think they are an excellent tool in resolving these types of issues. Sure beats riping a 55 gallon apart.

Can you post a picture under white light?Update. Another water change, did some rock scrubbing and blowing off of rock work. Sand is still being brown, dosed my second dose of MB7 also. So far just dosing the “low nutrient” system dose since my nitrates are always notoriously low. Looking into UV’s if this doesn’t work. Do I need to pump water through or can I plumb it to my overflow drain and have it go through gravity fed? I run a single 3/4” drain.
Also so pics attached. I think there’s some growth. The hammers are always full and the crybaby zoas are up to 7 heads. GSP still struggling, Xenia growing on its back island. The SPS are coming along slowly.
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