They are evil. They’ll eat your zoanthids and pally’s. Unfortunately they resist pretty much any sort of dipping out there. You have to physically remove them. I heard the 6line wrasse eats them.
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I had that same issue. My tank is Also 5’ long.
I bought a second xf250 now it works great. I keep them both on, at 10%. One on each end of the tank.
I have all kinds of corals. everybody is happy.
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