Help! Blood parrots in distress

I had 2 juvenile blood parrot, 2 green widow tetras and an apple snail in my 55 gallon tank, since there was plenty of space left I decided to buy a new tank mate for them. I visited a pet store near me and they had some polar blue parrots in stock but all were a little bigger than the parrots i already had, so I asked the storekeeper if i could keep it with them and he said that there was no problem.
So I bought one, upon introducing him in the tank immediately he started roaming in the tank and seemed to dominate every other fish, now after some days he has started chasing my blood parrots whenever he sees them and when it is time to eat chases them away before devouring everything. My blood parrots seem to be stressed and are always hiding. Please help before anything bad happens.

 

I would just take the new fish back to your LFS or if you have another tank move him into that. That's really all you can do. I've found "fish time out" doesn't work. The aggressive fish always goes right back to the same behavior. Even breaking lines of sight by adding more wood, rocks, and plants has never worked for me. Rearranging tank decor is usually when your situation is reversed (old fish attacking new fish) so I would say this definitely won't work in your case since the fish is brand new. You can let it ride for a few more days and see if the fish establish a hierarchy but, like I said, if it was me I'd just bring the new guy back and save my current fish the stress/death. But someone with better advice may hopefully come along to help you more!

 

Thanks, I'll call the guy from the store and ask him if he would take the new fish back

 

Thanks redrootfin i visited the store and got the fish exchanged for another polar blue parrot yet this one is smaller and almost the size of my other 2 blood parrots, i monitered them for an hour or two and they seem to be doing better

 

Thanks redrootfin i visited the store and got the fish exchanged for another polar blue parrot yet this one is smaller and almost the size of my other 2 blood parrots, i monitered them for an hour or two and they seem to be doing better

Awesome! That's great to hear.