good idea to use these?

I bought 4 of these, cut holes for 6 five inch net cups in each container.doing a perpetual with little to no veg times after clones root. Three air stones per bin. hydroton medium. There is a couple inches of space under each net cup but plenty room on the sides for the roots to grow outwards instead of down. 1000 watt lumatek, vented hood, 6x6 space . to many plants per bin? Should I cut down the number of plants per bin. Thoughts? http://www.walmart.com/catalog/product.do?product_id=17164519&findingMethod=rr with AC.
 
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