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I have just set up a 20 gallon, 20 inch tall tank. In it I put two angels, one marble and one silver, and a pleco. Both angels are about 1.5 inches long, the silver being a little smaller. For the first 10-11 days they all seemed to be great tank mates but then the silver became aggressive. He/She would nip at and chase the marble out of the open water and into cover relentlesslly. At feeding time its the same thing and the marble gets about half the food the silver gets. The silver even takes the occasional shot at the pleco. Online I found info about angels stating that 2 angels in one tank is not the best idea. One can become dominent and make the others life misserable. At the pet store they supported this theory and sold me another marble angel (little bit bigger then the silver) to help even the balance of power in my tank. This did not solve the problem. It seems the silver just has one more fish to pick on. Given the size of the tank I dont think adding another angel is an option. Any ideas would be appreciated.

Angels are shoaling fish in the wild and single pairs can cause problems. Your LFS was correct in saying that odd numbers usually help by giving the 'weaker' fish a bit of space whilst the others are being harrassed. Unfortunately, it seems that you have a dominant fish in there already and even this new introduction may not seem to stop the dominant one giving them hassle. Unfortunately your tank (as you know) isn't big enough to add more and its a case of 'thats life' unless you decide to re-think your stocking choices.