I have the clip on checker and I have a major gripe with it. When in use, you can't fill the water up completely to the brim. The surface tension of water grips the checker and starts to use the checker as an overflow.
Do you have the one with the nub?
I believe I'd be keeping my water level about 1/4" -1/2" below the top. I'm looking at using the clip-n that comes without the nub... would you think this would still cause a siphon effect?
bitFULL, this is my first tank to have any type of lilys and to use a canister type instead of hob or bio-wheel filtration. I'm super excited about the clean look!