Hi, this is actually my first post here - I hope that's okay! I just didn't know where to turn for advice with all of this :c
I bought 5 neon tetras for my then empty, cycled 10 gallon tank about a week ago, and everything was fine. They seemed calm and never chased each other around, so I figured I could buy a Betta to put in with them. I carefully selected by Betta by holding him up to Neon Tetras tanks in the store - he didn't flare at them, acted okay and everything! So I bought him and was ridiculously happy, because he's absolutely gorgeous.
I brought him home, floated his cup to acclimate the water, etc. and after a bit, I released him. He was started to chase my Neon Tetras - not to eat, or else I think he would have done so very quickly! I panicked, put him back in his cup, and floated him some more.
After a bit I repeated my actions, and he didn't seem concerned with them, and they didn't care about him, so I let him back out. About 30 minutes later, I could only find 4 out of 5 of my Neon Tetras, so I panicked and left him in his cup all night.
In the morning, all 5 were there, so I repeated the steps again
and he was trying to nip at them. I relocated my Neons to my 29 gallon tank, but I'd really like them to live together if possible, because I absolutely love seeing my Neons in my room :c
Is there any way I could stop him from being so aggressive? I've had Bettas before, but I've never tried to add one to a community tank. Any and all advice is appreciated!