I have the INS-135e. It is a great skimmer, but waaay too big (unstable) for my still lightly stocked 40g. I'm getting in a waveline dc-3000 skimmer pump today, going to try it out and see if it will be more stable on a lower setting than what the eheim 1260 is putting out. If not, I'll slap the dc3000 on a vertex in-80 body and sell the 135e. I think the ins135 (or 135e) would be fine for a 150, especially if that is including sump volume.