Thanks Essjay, I've kept it over 30c since you messaged.
All of the spots seem to have gone now, continuing with the heat and meds.
Current ater readings are:
PH 7.4
Ammonia 0
Nitrite 0
Nitrate 10 or 20
So I'm 3 days in now with 0 readings, so no water changes or anything until day 7?