08-01-2007, 03:23 PM
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A floating plastic, or net but I think plastic is better, unit that you put in the tank. It has tiny slits or holes in it and you just sit it in the top of the tank so it's all the same water and all the same bacteria form the filter going into it. There isn't as much circulation in them obviously so every day just lift it half out the water and back in, slowly!!!!, and that will make sure the water is being changed.