I'm getting a bit worried about my veiltail betta.
Long story short, shortly after a water change about two weeks ago, Marm started to have swim bladder issues, he kept sinking, and mostly stayed on the bottom, propped up using a rock.
Tried fasting for 3 days, then a bit of pea. Tried fasting for 4 days too.
Since two of my other bettas seemed to be having similar symptoms, a couple days ago I decided to start Tetracycline. Currently on the third out of four doses (as according to the package). Also have been feeding him Jungle's antibacterial food (also on day 3).
Before I started the antibiotics, I noticed a spot on his right side that looked like the scales were sort of "pinched together".
Not the best pic, but this is from about a week ago:
Now it looks like he's actually missing scales in this area.
I'm wondering if the missing scales could be just from rubbing on the rocks/plants when he's trying to prop himself up, or if it could be a sign of something else.
Also, tonight, shortly after feeding him, he seemed to be breathing heavily, though he seems to be breathing normally now.
Other than being a bit listless, he's still eating, his colour is good, and he responds to me moving near the tank.
2.5g mini bow, with mini filter.
Heater currently unplugged, temp 78-80F.
A chunk of java moss, a few rocks, and a piece of driftwood.
I don't know if I'm being paranoid, but could the driftwood be throwing something off? It's a piece I collected from the beach (not sure what kind of wood it is), boiled it for half an hour to an hour, changing the water at least 3 times. It's been in there since I set up the tank, 3 months ago.
Can anyone help me figure out what could be going on with him?