Hi last night I noticed my 3-year old betta fish Bibbles lying face down in some plants. I gave him a gentle nudge and he skittered across the tank and lied down again. This morning he's doing the same, breathing but lying on his side at the bottom. With another nudge today he went up to his leave near the surface and lied sideways on that, then slipped down again.
You may see he's got a big thing above his left eye. He's always had that. He had a rough beginning, was more of a rescue. Two months ago he acted like this, lying around, but not as desperate-looking, since perked up like normal.
I'm wondering if I should quarantine and give antibiotics.
I don't have all the stats people typically give, like pH and buffer, but here's what I do have.
20 gallon tank, live plants, one betta and six neon tetras. I do 20-25% weekly water changes.
Nitrites - 0 ppm
Ammonia - 0 ppm
Nitrates - 20-30 ppm stable.
Water temp - 72-73F
Thanks in advance