I am thinking you are talking about an ebb and flow set up and if so and growing from seed, I would start 6 or 7 and hope for about 4 females to grow out and this is with about a 4 to 5 week veg, but believe me it will be a tight fit, but if you are able to get a good set of clones from the first run I would put 6 to 8 in there and veg for 2 weeks.
Adieu
BlueBear Reviewed by BlueBear on . # of plants to res size Folks I am almost ready to start my first grow. Just got my beans from Alien. Unbelievable fast shipping to the states. I will be using a 18 gal res the lid dimensions are roughly 15" wide and 21" long. I will be using 5" net pots. I bought a 4.5" circular saw (thanks latewood for the tip) I will be using a 400W MH for veg and change to 400W HPS for budding. What do you all recommend as far as how many plants I should grow to get the best yield. Merry Xmas :smokin: Rating: 5