I think there isprobably more than enough floor space for the apistos and the D. filamentosus, provided you give them plenty of cave structure on the bottom. Plants will tend to break up the "turf" into sections, making territories easier to define. But the filamentosae will do best in water that has a TDS of 10ppm or less, and this is very soft for succssful plant tanks. I think you may find it to be a tough balancing act. Other than that, I would think about tossing in some "top water" fish, like hatchets, just to get some vertical balance in the aesthetics (sp?) of it all. Bob Dixon