Join Date: Oct 2010
Location: Victoria, Australia
Frogbit should be bigger than duckweed? Mine always has been. That's one of the reasons I love frogbit, because it is bigger and it sends down quite large root systems.
I have seen a few people keep their floating plants sequestered by getting suction caps to hold airline tubing, attaching them to the sides of the tank and then using airline tubing to act as a barrier. Seems to work quite well and looks rather unobtrusive.