> Tom, you sound like me about 6 months ago. :D It appears that biowheels are > not really necessary and may even be counterproductive in a planted > aquarium, so I took mine off. Everything is doing fine. > Dan Dixon > Thanks for the input, Dan (and everybody else). I will remove two of the bio-wheels and monitor levels for a week or so. If it looks good, I will remove wheels # three and four.