Welcome to the forum. I haven't been here long, but have found some very useful information and advice.
I would ask (beg) that when you consider future fish purchases, you stay away from glowfish. It's a cruel practice altering fish so that they become fluorescent, painful to the fish, and it shortens their lifespan considerably. It may also have something to do with their aggressive behavior, although tetras are often fin nippers. I would increase the size of your school to at least 8-10 fish. I believe that white skirt tetras are the species most often altered into glowfish. If so, they should school with your fish fine. A larger school will help disperse the aggression, so no single fish becomes damaged.
3g betta, 29g molly, 90g Amer cichlid, 90g community, 137g African cichlid, 220g water garden, 6,500g koi pond