The cheaper way to do it (if i dont get the kit) would be to do a floating fish tank hydro system... lol I dont know how widely used it is, but I have seen my father-in-law do it... Its amazing! All you need for that would be a air stone for a fish tank vs. the irrigation pump ($12-$30 vs $50-$200) lol I found a pic on-line. Same concept as the hydro, but hell if you have a fish tank at home... you are good to go. They say Styrofoam is the best floating platform.
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Update: took the covers off my fluros... thanks everyone! Going to be replanting with new soil either wednesday or thursday (whenever I actually get to the store). I am also going to be clearing out a 5' x 5' storage 'closet' in my basement and re-furbishing for growing. There are only storage containers in there now. It has brand new drywall in it that is already painted flat white, and I can control the space a bit better than a counter top. (that, and keep it better closed off from the 3 yr old who keeps inquiring about my flowers... yikes!) But, all should be going much better after this little move. Hope to have it all done after x-mas (4 days away- yikes again).