most likely no...red terrors <festae> grow very large and are very aggressive. the silver dollars might be ok because they're quick and the plecos, if you're lucky, will get ignored but there's no guaruntee.
If you want festae then I'd devote the tank to them.
as for green terrors, these aren't nearly as aggressive usually. I would go with maybe one Green terror and a severum or something else fairly passive but that has lots of color.