My betta fish was doing fine in his tank. Been changing his water every Wednesday (50% using a gravel vacuum). It hasn't been a month since he has been in the tank, the first water change was 2 weeks ago. I've been using the same brand of water for the change. I have also changed the filter cartridge with the water changes.
He is now sulking? I don't exactly know, but he is not swimming anymore like he use to. He would slowly swim around the tank, and when I got close, would swim back and forth like he was happy to see me. He just floats now, just stays at the bottom and doesn't do anything. I had problems earlier with him, but he seem to have overcame those.
I didn't give up on him then as he was a happy fish and didn't give up on me, but now he doesn't seem happy, and as if he has given up. I'm afraid that he isn't just sulking or tired/stressed, but that he is really sick. Can anyone help me?
Also, here are the old threads
Betta not eating.
New betta owner needs some advice.
EDIT: Just did a pH test, and it is way too high, along with hardness and alkalinity. Any help to keep it stable? was fine when I checked it just a few days ago.