Skimmer for a 400gal system

[DSlater]

Ran our 300G system with a beckett style skimmer for over a year and could never get it dialed in for any length of time, constantly needed attention. Picked up a used Deltec 902. Once set up I haven't had to fiddle with anything, just empty once a week.
There are a few larger tangs in the tank so I could never get the nitrates down below 25ppm with the beckett, after one month of running the Deltec we are down to 10ppm.
Probably would have these results from a number of other good skimmers as well.