Help with Betta

[Rachel Gallaugher]

Hello! I am seeking help for what could be going on with my betta fish? I noticed it last night (2/25/2022) when i fed him, he ate a little then he darted around and swam to the bottom. Today (2/26/2022) when checking him he again was at the bottom, i did a water test, everything is normal, the tank temp is normal too. he came up briefly and received a few pellets before darting down to the bottom again. later on he was sitting kind of bent so i nudged him and he swam up to the top then quickly sunk back to the bottom again. last tank cleaning was 2/20/2022 and i planned to clean the tank again tomorrow (2/26/2022). all help welcomed, i am attaching pictures of how he is sitting at the bottom. TIA!!! 

 

edit to add: nudged him again and he come closer to the front of tank, i noticed this on him (circled in purple) also sorry for photo quality, my camera was struggling to focus. 

Edited February 26, 2022 by Rachel Gallaugher
New photo update for help

[Colu]

Possible bacterial infection I would treat with kanaplex or maracyn2 when fish are lethargic it's usually because they are putting all of their energy in to fighting an infection

[quikv6]

Please post water parameters.

[BAT]

@Colucould it be a swim bladder problem?