Hi, I'm now taking care of a relative's betta fish. They didn't read up on fish care so he developed chronic swim bladder disorder and fin rot. I've never had fish and am trying to learn as much as I can so I can help him! He's so sweet and is hanging in there while I'm cycling a 5 gallon for him but in the meantime I have him in a 1 gallon with a live anubias and doing daily 50% water changes and one 100% a week. Water is at 76 to 78 degrees. Tap water has .5 ammonia but I'm using Prime and have an API Master test kit. It looks like the anubias is keeping ammonia and nitrite both at 0ppm. He eats well but is still battling fin rot. It is getting worse even with great water parameters. I'm sure the SBD stresses him out and I read that stress can also cause fin rot. But while frantically reading as much as I could I just learned that if you have plants it can cause a ph crash in the morning. This morning I tested his water and our tap water. Tap was 8.3 and his was 7.2! Now I am panicking. Is there a way to keep the anubias, do water changes and keep a constant ph with no morning crashes? Is there a natural way without chemicals? What should I do? Thank you!