I really don't know what else is happening but ever since my filter crashed, it's been cycling. Now I just noticed one of my fishes (Black moor) has 3 cotton dots on him that I suspect is ich. I just noticed this yesterday and did an immediate 25% PWC. I have been doing 50%-75% water changes everyday or every other day for the last 3 weeks as I was advised to do so ever since my filter crashed. 50% for 2 consecutive days and if I skip, 75%. Water parameters for the last 3 days: May 25: 75% PWC Dose of prime Dose of stress zyme in filter No test May 26: 25% PWC Dose of prime Salt added for 55 gallons Temp increase from 20C to 25C overnight May 27: Dose of prime Cotton spots still there Temp currently at 25C and trying to get it to 30C Nitrite: 0ppm Nitrate: 0ppm Ammonia: 0.25 ppm pH: 6.4 Before this, my pH stayed constant at around 6.8 to 6.6 and I was trying to increase it with water changes. Now it's lower and I don't know if it's because of the salt in the tank. Also, my nitrate was always present and consistent at 5-10 ppm. And now it is 0 ppm. I don't know what happened to it. I don't know if the salt is effecting my like this. I normally don't add salt unless I absolutely need to and I thought yesterday was necessary because I wanted to get the ich out before it spread. I plan on doing a 50% percent water change today (May 27th). But I dont know what else I should do. I have a bottle of melafix but I don't want to use any medication until absolutely necessary. It is pricey and I heard it doesn't help with the tank. I do have a driftwood in my tank and I heard that can lower pH. Is there anything else I can do?