What size skimmer (AquaMaxx ConeS) for 180RR?
 

I am currently using Reef Octopus and what I have is a bit undersized. I am thinking of getting an AquaMaxx Cone S but not sure what's the appropriate size? Tank: 180RR with 75G sump. Heavy bioload with fish & coral.
I am thinking between the CO-2 or CO-3 just not sure which one is best (not sure if you can "over skim" but I've heard stories of people "downgrade" with zoa not happy for water being too clean?)

No chance of a Super Reef Octopus 3000? Or a Vertex Elite?

Im just curious why you are looking at AquaMaxx, as I will be setting up my tank in the coming weeks.

Aquamaxx EM300. I have it on my 150g, and it does a superb job, and is a tad on the large size for my system. Quiet, efficient, and small footprint.