BK Supermarin 200 or 250?

[sphelps]

Can't really go too big and you're potentially looking at 300 gallons of water to treat so 250 for sure. I ran this skimmer on a 100 gallon tank and because it was mostly LPS and large clams I thought maybe it was working too hard, simple fix I just ran it on a timer for 12 hours instead of 24.

The reduction in performance you're referring too is likely due to what most experience with good skimmers, they work like crazy at first and then slowly start pulling less and less, this is due to less organics being available due to increased skimmer performance not the other way around.