Possibly flukes? I'd try a very mild dose of formalin, just stay on the safe side of the doseage and watch em close.
I agree with the others, dont chase the PH, it causes more issues than its worth, a piece of stocking with Hauraki gold peat in yr filter will make the water nice and soft with plenty of tannins for your rams. As stated check the KH and let us know the results. IMO you should join the Dunedin club, Norman is da man and has been keeping fish for longer than I have been out of nappies (at least a year & 1/2 :lol: )
Stable PH is most important!
HTH Owen