How many pumps do I need?

Not really answering your posts, but have you thought about lights? I'm getting ready to order mine, and boy are they expensive!! I wish I would have thought ahead and bought them a while ago. I'm going to have over $600 in mine (yea, ouch!), but I'm also not skimping and going with Metal Halides so I can keep just about anything. And all top quality parts, no shortcuts. Just an idea to add to your list:! I know, mine keeps growing faster than my bank account too!!! Good luck and don't feel bad throwing questions out left and right!!!