Help, how many dwarf angels can a guy have

[Coleus]

well i have 3 in my 155 gallon and they have been with each other for more than a year now. Here is what i did

1) Introduce the most aggressive last so here was my order: golden angel, multi color and then flames. My flames now is the boss of all 3.

2) Lots of hiding cave so they can run and hide when got chased

3) Feed them regularly with auto feeder, 4 times per day for me

4) Little bit of luck (this is important hahah)

Good luck and I hope you will have success with yours