Today I noticed that my Betta has been lying on the tank substrate and barely able to swim. I did a 50% pwc and came back a few hours later to what I thought was him dead. However, he's holding on for dear life and I'm uncertain if I can save him. I've been battling finrot with him since I got him. He made progress but then got worse. He's also had stress lines since at least a month after I got him. I never could get them to go away. (I have not used any meds to treat finrot. Was doing pwc daily or every 2-3 days). I did see some red on his head which I've never noticed before. The red on his fins have always been there. Tank 5.5g Temp ~79°F Current Parameters 0A 0Ni 10-20Na (doing another 50% pwc Only other inhabitants is a nitrite snail which shows no issues.