Chaeto is ok, but it doesn't grow as well as caulerpa. Chaeto also is woven together - and really needs to be tumbled for maximum growth potential. It also has a tendency to collect detritus, and will need to be shaken regularly.
Personally, I would look into those small air powered skimmers that you could fit in the back of the filter. But, I also like macroalgaes as well - so I'm kind of split over that decision. Either way, it's your tank. lol