I don't think that you are over stocked, my 100 gal has a lot greater fish load than you do. You do have an interesting mix of fish and could have a problem adding your rams to what you have. Tiger barbs get real nippy and I don't think the rams could compete with them. The same thing with the red tail shark, they eat alage but get quite agressive for more passive fish. Your ghost knife will get big enough to eat the rams. I would keep and eye on your angel fish with the GSP, barbs, and red tail shark. They all can pick on the fins of your angel. I like the rosey barbs since they eat alage and seem to leave most everyone else alone. Don't forget that the rams need a bit warmer water to do well.
Hope this helps
