Whats up?

If you go the cooltube route then make sure the hot air is sucked completely out of the tent via ducting otherwise it wont be any cooler than a bare bulb inside the tent. Im not sure if you knew that but by the way you described the small fans on either side of the tube sounds like you didnt. Also your best bet is to have one big fan pulling air through the tube instead of two small ones pushing and pulling.

Im using a 600w air cooled hood that is turned down to 400w and it can still get hot with a 400cfm fan pulling room air through it. Make sure your ventilation is up to par before you plant your seeds!!!

Goodluck!