Yea I understand the feeling since I'm running internal filters myself. I like how it lets me put the tanks right up against the walls in my room. Can't do that with a HOB filter. How's the intake on that filter? As airangel said you will have to cover up the opening with some sponge or stocking to stop baby shrimps from getting sucked in.
Good news on the frogbit. How do you stop it from covering the entire top though? Or does the roots mostly grow longer and it doesn't really multiply?