If a person had a hang on skimmer and a hang on refugium with live rock/sand in it, live rock in your tank & sand wouldn't this be almost like a sump, would it be enough filtration for a 55 gallon system?
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I tried that I have a 90g tank with 175 lbs of live rock couldn't keep the nitrates under 20 with 4 fish false lemonpeel angel, 6 line wrasse, maroon clown & squareback anthias.
I have a lifereef skimmer added a 19" CPR hob refugium chaeto grows great but nitrates only went down to 15 it's a mystery to me so I went & got a 40gb tank at the petco $1 g sale last week & now am going thru a wall & redoing kitchen cabinets to fit the sump