I bought a new ProClear Pro 75 and had nothing but trouble with the skimmer. I found it nearly impossible to get adjusted. Skimate production was not good either.
I spoke to the owner several times and he just jerked me around for 2 months till I gave up. Their LifeTime guarantee is worthless.
Hopefully, you will have better luck with the larger skimmer in the 150. If not, you may have sufficient room in the wet/dry to put in an aftermarket skimmer. My 75 was too small for that.
Skip the bio-balls and put LR
rubble half way up in the chamber. Keep the water level in the wet/dry high enough to cover the rubble. However, make sure there is enough room left in the wet/dry so that when you shut the pumps off, the back draining water from the tank does not overflow the wet/dry box.