well a little update, flatworm problem is still there. but, i will say, not as bad. dont notice any on the glass anymore. but they are still on rocks and powerheads. i now run 2 skimmers on my tank to make sure my nitrates stay in line and purchased a reactor for carbon (no longer just a bag in the sump). everything else in my tank is fine (just temp changes now)
the mandarin may not be eating the flatworms, and i dont think the sixline is either.
so i was looking and saw the yellow coris wrasse (its not really a coris) and was wondering if i would be ok adding it to my tank. will it fight with the sixline?