I just picked up a Mini Jet MN 404 pump for a 30 gallon tank. I felt that the next higher (MN 606) was too strong on its lowest setting, which also falls in this range. Petsmarts website can tell you about both of these pumps plus the Micro Jet pumps. The Mini Jets are just slightly bigger and need a half in hose. I don't know what size the Micro Jets need. I payed $15 for mine at a local aquarium shop. The MN 606 was $19. Similar to Petsmart, but no shipping and I got it that day. The reason I also chose Mini Jet as opposed to Micro Jet was the cord. Mini Jet had a flat cord, so it would come out of the tank easier since most manufactured tanks have those "dips" (or whatever you want to call them) in the top back of the tank. The Micro Jet pumps are grounded so they can be used outdoors, need the three prong outlet, but their cord is a lot thicker because it is round. Let me know if you want more information. I could tell you what the volume it pumps and the height is if you want.

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