The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
I think that they are a great addition to a tank. I think a 20 will fit under you tank wont it. They are good for lowering excess nutrients and adding water volume
I have plenty of room, but doing a sump setup in addition to my canister and HOT protein skimmer seems a bit cluttered. I should have built everything into the same system.