I have an ASM as well, smaller model though - you can start running it now as it does take a bit of time to break in, my took a little over a week before all the micro bubbles in the tank went away. Also now is an excellent time to learn how to tune/adjust it at the same time. Just move the pipe down a bit so the collection cup does not fill up, you'll want to have the bubbles at the top of the cone but not actually spilling up into the cup, i.e. dry skimming for now as you don't seem to have any fish etc. There are several forums on skimming you should look up. It took me a while to get comfortable with mine as well.