ok,im not disagreein with you but 50litres is too much for my budget,that would cost me loads in nutrients haha,were i went wrong is puting them in 25litre pots in the first place,how tall do you grow your plants in veg?and how tall is your finished lant if your using 4gal pots,think 25litre pots was a big mistake,hopefully 5 litre a day should be enough for them..i just put a post up about my temprature again too,the weather has picked up in the last few days an my temp is 32degrees even with the added inline fan,,only thing i can think of now is a cool tube to suck hot air straight out.thanks