u/CynicalVelociraptor3

Idk if it’s swim bladder disease but one of my white tetras is acting weird. The other day I noticed it was swimming weird (floating/ drifting) and not swimming around with the other fish. Today I noticed it hanging out in the corner of the tank near the top to mid range, almost fighting the reflection but at an angel (tilt). This is unusual behavior coming from the tetra. (My angel fish sometimes fights the reflection). It’s the smallest fish out of the school. I’ve been sick the past few days and haven’t physically been able to clean or isolate. The tank isn’t dirty but due for a water change. I also had a weird biofilm oil layer on the top out of nowhere.