So I've been keeping my tadpoles for a few weeks now, but their population is slowly decreasing. I think this is because of the huge amounts of waste they produce and the difficulty in managing it. What I've been doing is just using a turkey baster to remove some of the muck off of the bottom every day. I just put in a small filter yesterday...

What do you do to keep the tank(s) clean? Do you just keep the densities super low? I currently have all of mine in a 20-gallon long tank...