I have run a similar set up, years ago. Interestingly enough botanicares coco rox is the media mixture I've run since 08 and I love it! I call it "the mixture" though, because I've always made it. In fact, Ive advocated its benefits to my buddies who own the grow shop I go to (the owner is a contributor to Max Yield mag)and when people went in and grabbed both (coco crutons and hydrolite) they always said "oh you know so and so, hes the only one who uses that shit". that said, in RDWC I would run straight hydrolite. Thicker stems, longer petioles, bigger leaves. Not a fan of advanced. I'd invest in more flora series. But beneficial biological activity might be great, if done right, and you keep clean. A seaweed extract or marine plant extract like synergy,
nitrozyme, or
liquid karma with a Lil molasses (not too much) would Def kick it up a notch! Clean between res changes, like normal.
If you're up for a change, consider 3gal or 5gal containers full of the mixture, automated irrigation, top fed with 1/4 in tubes held in the pots with tube stakes, 1/4" tubes come off a 1" irrigation piping from the pump, in a low profile reservoir, over which you build a table from 2x4s and make or set trays (on the table you built) that drain back in the res. There are low profile 100gal reservoirs that are like 15" inches tall that can handle two 1k lights (2 trays). With a 2x4 on top it's like 19" off the ground so you loose a Lil headroom.
When I did the Rdwc it was a lot of work. I had good results but I didn't like it(the grow). I used flora series also. With
hygrozyme and diamond nectar (which was new! At the time) and
liquid karma (this was before pure blend"pro" when they only had pure blend, which was a static tea)... It was good. But the grow sucked. To me. I switched to "soil". I just dink around a lot.
But yea, run straight hydrolite, or dyna rokII, or maidenwell (medium grain). Make sure your aerobic tea is well strained and add 24 hours, a day or so, after you fill the res. I'd add 1/4 cup or less of high brix molasses per 5gal of nutrient solution.
