i am looking into a refuge to solve that
I just did this. My trates were at a steady 10 or so for a long time and then just after I put my PT in QT
my trates sky rocketed to 25. I'm guessing this had something to do with frequent use of selcon and garlic additives (I dosed all tank foods and then split them up for feeding). I did 2 back to back (2 days apart) water changes of 20% to get them back in line and added the fuge and now my trates are sitting at 5. They didn't budge from my last water change (I was hoping the fuge would drop them all the way to zero, but no dice). I haven't tried skipping the water change yet to see if they'd climb in time or not. I am just happy to see them holding at 5.
To get to the point of the question
I change 20% every 2 weeks on my 120.
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