If I wasn't in a pinch with time I would definately have ordered the 60 watt air pump. The piston driven kind for sure. I was looking at 1-2 weeks for delivery and I can't wait that long. I'm going to flower all these plants small since I have no clue what kind of stretch I'm going to get on some of them. I only have about 6 foot height to work with.18watt air pump?! thats nuts! im going for that commercial air pump that has 12 splitters
why hight problem? a basic house have to have atleast a 8ft ceiling, plus the reflecter so your down to 7 then 1-2 ft away from reflector and thats 5ft you have.
not really understanding why you are getting a big "stretch". I was able to keep mine very low in a SOG style...outdoors. good luck with your future endeavors.
Laterz