ok i have a black molly which today i found her swimming up and down the side of the tank so i put her in the breeders net whats that why is she doing that?

FOr the passed couple days she as been hiding in the plants and she was always by herself and she just came out today where i saw her chillin with the other fishes before she started to swim up and down on the side of the tank whats alll that?

1. its a fish. they swim.

2. a long shot- but he/she could have some sort of parasitic issue or infection. change your water and add some aquarium salt. if nothing changes, your fish prolly just has alot of energy.