have just switched to some oxypots to grow my mothers. I take many cuttings so i need a hydro system that will allow rapid growth and repair after stripping a mother. I bought 8 oxypots and they are great, however i am having real difficulty keeping the temps down. they are averaging 83*f which is far too high. Ive tried adding frozen coke bottles but no joy they thaw out quickly and dont seem to have much effect. i was thinking about a chiller but would that mean i need a chiiler for each bucket? help.........