so i heard that frogbit, in order to grow well needs minimal surface disturbace, high lighting, and good air exchange above the surface of the water. because my tank is a DIY themed tank, i figured i should find a way to aerate the surface of my tank. so i created an airline above water that would circulate the air between my glass hood and the frogbit on the water's surface.
i used suction cups and silicone tubing with holes poked into it to create the airline. once i enlarged the holes enough, the air began to flow, as i can see the surface of my tank have a slight ripple. hopefully this will help my frogbit grow
just thought i would share an idea. any comments welcome