Water movement (pumps & wavemakers)
I purchased a Mag 9.5 for the return on my new 50 gal with sump. I have a Octopus 150 skimmer which claims 530 GPH, so I am relizing the 9.5 may be a little overkill. My main concearn is heat and a little less concearn is noise. I have read the Eheims are cooler running than the mags. If so...