Hey everyone, I have 7 neon tetra, 7 rummy nose tetra and 3 network cory. Everyone seems to be getting on fine the cory's shoal together and play in the filter water, rummy's shoal well but the Neon's are fighting each other constantly. There's a couple in there that just spend the day tormenting the others darting towards them and having a go, some retaliate others don't. There's one that hides in the plants all the time. Is this normal behaviour?