Rams are hardly aggressive at all, it's the bettas
you worry about!
Bettas can feel very territorial and take chunks out of the rams, will rip up their fins, and they often get very stressed out because of the bright coloring of the rams.
Plus, rams are very hard to take care of. They are not
a beginner fish. I've researched them for months now and trying to prepare myself for a pair of German Blues and Bolivians. They do not take to change at all and need very specific water perameters or else they get very stressed and will die. Most people experience only owning GBRs for 6 months of less because of how delicate they generally are!
I plan on having a sorority with them, but plan on using only mellow females who I've already temperament tested. Plus, they will be in a LARGE tank (probably 55 gallons+) with few betta females (max 7 or 9) and have many hiding holes on the bottom of the tank and be fully planted, as well with floating plants. It's a very big project for me. The only things in the tank will be the females, the 4 rams, and some cories (pygmy or pandas).
I would definitely say no, because if one thing is wrong, the rams will
suffer! A pair of rams will fit nicely in a 20 gallon, so why not just get a 20 gallon specifically for them? They'd be way happier!
I agree, they're gorgeous fish, they're one of my favorites! <3