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This is a good question, given the size of that disk array, and the 400W power supply. Assuming the PS is running at half-load, then you're taking 200W, and most of that energy is lost as heat. I've thrown a 15W aquarium heater into a 10 gal rez (out in my insulated, but unheated garage), and...

I'm building a cabinet for my very first grow, and have settled on Master Blend (their 4-18-38 Tomato formula, plus Calcium Nitrate (15.5-0-0) in equal parts, and Epsom Salts (half as much), very similar to Jack's. Real cheap, and goes a LONG way, and as I understand it, needs no additional...