I honestly didn’t use any chemicals other than treating my water with prime. The very first day I did a water change of 80% and the next day when I tested, my ammonia was still pretty high so I just kept doing 80% water changes everyday until it was cycled. It was a very tiresome process after about a week but I haven’t lost any other fish since that first mass water change. Is your pleco the only fish in your tank right now?
Yes, it is the only one. I only had the betta and the pleco. Now I have to make sure the water is perfect to get other fish my pleco looks miserable. I hope the water gets good asap.