Betta Fish: This is mango.

Hey guys, professional semi-amateur novice betta keeper here. I got mango a few weeks ago from the local petco, he was sad in his little cup so I decided to pick him up. My question is does he look ok? He’s currently in a…

Tank: 5gal

Temp: 79°

Sponge filter

Parameters: pH 7.2, ammonia 0, nitrites 0, nitrates 5ppm.

I’m worried about his top fin specifically that he may have fin rot, so I’m here asking you kind people for your opinion. TIA