Hey, I was just wondering how much water movement I should be aiming for in my tank. I currently have a 40g with a powerhead on one end blowing water around, and a cannister filter under the tank that is rated up to 75 gallons. It causes quite a bit of water movement, and I was trying to figure out if it was too much or not. My concern was that if I reduced the movement, it would allow more buildup of "junk" along the bottom and in the plants. I suppose that I could just syphon from the bottom when I change water, but I had read somewhere (can't remember where) that you should leave the substrate alone and change your water from the column. Any ideas on these questions? Plants are growing moderately well, but I am about to be getting more and want to give them the best possible conditions. Any info would be great, thanks.