I got a turbo twist 9 watt for my 40 gal, and i want to get another for the 75 gal...should I get another 9 watt, or go for the 18 watt? also, what size pump? Now i have hte eheim smallest model of hte hobby pump, should i get the next size in that too? thanks

I've got the 18W turbotwist, and I you'll need to get down to 110gph to help with parasites. That is very low.

Hope this is useful.

Slugger