* - LiveAquaria says the Chromis do best in groups of 6 or more. That's kinda high, as I think what I want now is a bit intense in number. I know the watchman and the neon blue won't spend a lot of time in the water column, and that the mandarin spends all its time hunting on the rocks, but I'm a little concerned with bioload. The skimmer I have is grossly oversized for my tank, and it really does a good job, but I don't want to overdo it. So, how many total do you think I should cut, if any? I'd consider cutting the Chromis if need be, but I'd like the variety if at all possible.
For a 125 gal what you have chosen is just fine and I think you would be fine with up to 8 of those chromis. A nice looking fish that will look great in a school. Just be sure the tank is about 6mo+ old and stable before adding that many at once.