This will need some backstory! I have a 10 gallon tank, and I used to have three cherry barbs, 4 tetras, and two glow light tetras. They had all lived peacefully for almost 6 months. I lost one glow light tetra months ago- no tank issues. BUT recently I lost 1 cherry barb to a weird disease and then two weeks later lost another cherry barb to the same thing. The tank has been treated and everyone is healthy. Since losing the two cherry barbs, my one leftover cherry, Barb has incessantly been picking on my tetras and cornering them and now they are hiding or when they come out they get chased back in! I was thinking he (pretty sure it’s a he) was picking on everyone because he was alone so I went to the store and they didn’t have cherry barbs, but they had golden Barb’s and I was told that they would help and they would school together like the other cherry barbs did. So far it has not helped and he is still picking on my tetras!! He never did this before loosing his two other buddies! I don’t want to ~get rid of~ (to put nicely) but it is stressin my other fish out!! Suggestions!?