I'm posting this for a friend. I'm not sure of all the details of the tank, but I do know she's lost two fish already without any visible signs of issues.. The obly symptom for them was heavy beathing a couple days before they passed.
Now her golden ram is looking pretty rough, and breathing heavily.
I do know it's a heavily planted tank. She does 30% water changes every other week. API test kit shows 0 ammonia and nitrite, 5-10 nitrate, 6.4 pH and temp is kept at 79. Before she saw this fish she had started dosing Prazipro, so the first dose was administered two days ago.
Any ideas? If you need any further info I will ask her. Not sure of the tank size, but she seems to be a very knowledgeable fishkeeper as far as I am aware.
I think one of the other fish lost was a ram, not sure on the other. I'm going to ask that right now, as well as tank mates.