Good point!
I think with a smaller system, like we had, it is difficult to mimic all the features that you would find in a swamp or pond system in nature. That is the goal, to have things working together harmoniously, and when such is accomplished, you will find that issues with pests and whatnot will be much fewer and easier to manage...
It was our first attempt, and very much a learning experience, so I feel the next time around will be that much more successful!
Thanks for your comment!