Gfo can get saturated within a couple hours if po4 is high, once it is within range of around .03 or lower it can last a month or so.
Imo your feeding alot, i have 7 fish along with a bunch of snails and only feed 1 cube every other day in my 75 gal. But i do feed dried foods daily for my anthis and breeding clowns
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75 gal. mixed DT, 100 gal. sump, 50 gal. fuge,
Clownfish breeder
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