HELP.. 3 SR Community..

Hi Bros n Sis, I'm new to this forum.

Recently, I bought 3 juvy N1WAN reds about 7-8 inches. Pick up date will be a few weeks later.
I'm planning to put them all in a 4x2x2 tank for the moment. And, early next year will move to 7.5x2.5x2.5.
I need help experts! Any new tips that you can share to make my comm successful?


Here's a list of the things i know to establish comm, pls. do correct me if I'm wrong:

1. Reds are less aggressive than golden arowanas (RTG, XBACK..)

2. Need to create strong current to make the aros busy (prevent fights)

3. Feed 2-3x a day to ease hunger

4. Cooler water temp make aros less aggressive

5. Introduce all of them at the same time in tank

6. Ideally, all of the aros should be of the same size OR 1 aro should be a little bit bigger to easily establish ALPHA?

LAST..
7. You need at least 5 aros to make successful comm?! As said earlier, RTGs > aggressive > REDs.
Will it be harder to establish 3 REDs compare to 5 RTGs?


Thank You in Advance!