Quick update. It's been a full two weeks since I added the ram to the tank, and there is still a small amount of chasing, but it is extremely rare and doesn't seem aggressive at all. In fact I don't think the betta would pay any attention to the ram if it weren't for the fact that the ram doesn't have any clear social awareness and occasionally swims circles around the betta and rubs against him (literally). I think this tank will work out fine. Neither look stressed. This GBR naturally has very poor coloration, but I can live with that given the beautiful pair I have in my 20 and her lively personality. Here are photos of (a) The tank with the new amazon sword and hygrophila, (b) betta with the GBR and (c) the GBR. Thanks for the help.