I dunno what to do anymore. I’ve been kinda winging it without a water testing kit. I change my dear Freddie Mercury’s water every week so things have been fine. Got him in July and he had fin rot from being in that tiny Petco cup, but then he was cured after about two weeks and had new growth, was looking good, allat. But just two days ago I noticed his tail fin tattered again and by the end of today he had two new pinholes. I feel like a failure. How can I help him? I’ve been giving him salt baths for 15 minutes every other day and treating him with betta fix although granted I’ve seen a lot of mixed reviews on. He’s in a 5 gallon with a filter and a heater btw. P.S yes he’s flaring at me, I dunno why lol he just started to do this last month and hasn’t ceased to greet me that way since then