I take it theres nothing else in there at the moment? Have you cycled the tank?
2 males in a 20G could well end up with problems. Watch them carefully for the next 24 hours, if nothing changes take one of them back. Rams if kept in two's should ideally be a male female pair. And water quality is very important with Rams, you'll hear different figures quoted but my experience is that minimum of 30% weekly, and ideally to get full colouration (or if your pH is high) two 20-30% changes a week.
As for what else...any flavour of community fish. Personally I like pentazona barbs or some flavour of tetra, but depending on the size of the tank (if its 3ft or more long) I'd go for 6 praecox rainbows, especially if the tanks in a position to catch some natural light. Or even a mix of two types...some strange schooling mixes work great. For instance my ember tetra's and pentazonas look great when they school together.
So something like that, and a small school of corys - 6-8.