i have been using flood and drain in 1 gallon pots (16 of them)full of hydroton pellets( the same bag i started with) fro a couple of years now adn after gettin it dialed in with
botanicare pro grow adn bloom with some
liquid karma adn possibly some citris sweet if its sativa dominant strain i have no problems bringing in 2 lbs in a 3x3 tray using a 400 watt hid.
imo botanicare is the easiset to keep ph stable and worry free. not that i have tried many other brand names since everythign is so pricey. flood adn drain almost has a nft effect in the drain channels, youll notice the roots love to lay in there mid grow. i have a diy grow area fro this system adn it looks somewhat low class compared to most of these threads ive seen so i dont do the picture thang but if you want i am starting a new grow soon with a new strain (white russian from sannie)so i might be willing to take a few pics to show ya how i do it. its all about gettin dialed in imo. mr res is only a 20 gallon witch if its a
botanicare res its actually 15 gallons unless you want to get messy. if you use a 4x4 tray you are gonna need a 40 gallon res easily fro a bigger root mass. anyhows i love mine adn will never change to a new style fro dro. sorry bout all the mispells i must be a dislesic stoned typer lol.