OK... so far in my planted 10 gal
tank I got....
* Six Neon Tetras
* Three Harlequin Rasboras
* Two Panda Cory cats
The Neons and Rasboras get alone fine.
The Neons like to school of course
So do the three Rasboras and I do not think I want any more as they really seem OK with just three The are usually peacefully swimming together mainly at the upper level.
BTW, It seems like I probably have two females and one male Rasboras, although it's somewhat difficult to tell. .
I do want to get one more Panda Cory even it they are not really schooling fish and do a lot of things independently at times.
However I do not like to get just two of most any fish .