i would only need a 2 foot light or so for the lengthwise 10 gallons. They are actually for breeding/ fry tanks so im not too worried about the correct lighting for plants. I already have a 10 and 20h id like to put on the rack, hence the repeated 20h comments. Both of witch already have their own lighting. So the lighting on other tanks isnt an issue as of now.
Thanks for your help guys and i cant wait to see your designs discusonly