Got it. Glad I asked before switching. Seems the consensus here is that the issue is probably the bacteria. I'll add the carbon, keep up with 10% water changes. Should I get a cheap UV sterilizer then? Are the expensive ones worth the price, or are they functionally the same?I personally wouldn’t do a 20% wc. You might stress things out more.. I would ride it out.. also pick a salt mix and stick to it!