hi, added air inlet and outlet vents to room, and a fan that is very big and powerful, i was planning on putting it on a timer for just 10 mins a day because i was told by the shop it would completely exchange the air in my size of room in just 10 minutes, is this enough or should it be exchange completely more than once a day?


http://www.freefilehosting.co.uk/files/1458/1plant.jpg

http://www.freefilehosting.co.uk/files/1459/ailment.jpg

http://www.freefilehosting.co.uk/fil...ilment%202.jpg

http://www.freefilehosting.co.uk/files/1461/crop.jpg

this is from yesterday, theyre not looking bad, a bit droopier but probably from the heavy flushing/watering, still as yellow but not crispy anymore.

Strange thing is my water out of the tap was pH 7, but with a 0.75ml of fert added to a litre it is pH 7.5, show did the soil end up being brought down to 6.0 if it wasnt my fertz?