I have 1 Red tail shark, 5 white tetra, 2 checker barbs, 2 cherry barbs, 3 pristella tetra, 2 black phantom tetra, and 2 albino bristlenose plecos. I just bought the 3 pristellas and black phantoms yesterday night.

This is the first time i’ve seen my barbs harass fish. They keep attacking at my poor guys fins. Could this just be going on because they are new? I thought that those were the friendly kind of barbs and that they wouldn’t do harm. What are the chances that this will stop? The fins dont look very damaged, so maybe they aren’t actually eating them, but just like annoying them?
My tank is 20 gallons, so it’s right at capacity.My mother used to have a piranha so I think I will bring that up soon. I also have a 50 gallon tank I used to keep lizards in… but I don’t have a table large enough to hold a thing that long. My barbs are actually smaller than all of my fish except for the plecos. Maybe I could sneak a few more in? Will they school together even if i get some more later on?