Grow tent help PLZ!!!

Wat would be a good size tent for no more than 24 plants but they will b in 4 dwc resevoirs

id get one this size, have a look at there other tents.. for some reason it would be far cheaper to get 2 tents that are half the size
http://cgi.ebay.co.uk/GROW-TENT-2-4M-X-1-2M-MYLAR-LINED-FREE-DELIVERY-DR240W-/270560925539?pt=UK_HomeGarden_Garden_PlantsSeedsBulbs_JN&hash=item3efeb01763
you would have to flower them quite early thoe them getting to cramped