I hooked up the AC70 last night, just as is, not ready to be a refugium yet. The flow is way too much, but I figured out of I just pull the intake tube up a bit, it reduces the flow and makes it run silent. It was kind of loud before. So the more I pull up on the intake tube, the more the flow is reduced, so this way I don't have to cut anything or buy a new impeller, and can change the flow easily whenever I want, less or more. In the next few days I'll get it ready to run as a refugium, probably with cheato since I already have a cheap little light to use on it. I'll also run chemipure or something like it.
I'll update the budget tonight.