Yeah, it could help but I would say add another AC110, one seems a little under filtered, especially for rays. Water circulation is a good thing and might help get junk off the substrate, but more filtration is always better and for the same money. A decent sized powerhead, one worth owning, is going to set you back $60 or more for one to put in a 100g. Look at Hydor Koralia prop pumps and you will see what I mean. A cheap MaxiJet or Rio will move water, but a Hydor Koralia will move twice as much and use half the electricity. Naw, add filtration, You'll be glad you did.
Just my 2cnts