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They would compliment each other. The best place for an ozone generator is not in the garden, it's in an area that you don't want smell, possibly...
A 25 liter bag of Hydroton is 7 gallons.
SuperThrive is one drop per gallon. Not one DROPPER. RTFM.
That is a calcium/magnesium deficiency.
The question is not how many, but how big... You can fit one large plant, or up to, say, 16 small ones. Just depends on how quick you flower them.
This is what I use. It works great for me. Good quality, cheap price. http://www.discount-hydro.com/productdisp.php?pid=480&navid=53 Good luck.
Supposedly this product is supposed to stop that: http://www.discount-hydro.com/productdisp.php?pid=143&navid=17 I've never used it, but, I've...
Aerogardens are cute. They are not for growing buds, though. Invest your $200 in a real light and flood tray or something...
Your friend needs to grow a plant before he tells others how to do it! You must run at 24/0 or 18/6 or so until you turn to flower. Weed is a...
You want to soak the pot and then in a few days, water again with normal fertilizer.
Make sure that if you are using fluorescents, you use T-5's. Much better. Forget the globes. Worthless.
You should go with the 250. I think that a 400w is going to be too much and you'll have to deal with too much heat.
You should go with the HPS light. But, you have to deal with a bit of heat. If you can ventilate, then you should be OK. If you can't...
If you are using an RO unit, you should be watching out for calcium deficiencies. I've used this in the past when I get rust colored leaves....
You should check out this root stimulator: http://www.discount-hydro.com/productdisp.php?pid=431&navid=17 It works really well. I found it...