I have limited my search of skimmers down to these two models and can't decide which one to get. I have found the 250 for 190$ and the 220 for 150$. Can anyone tell me which would be the best skimmer/value. I have a 75g mixed reef, medium bioload. (5 fish, 1 purple tang- 3" 2 clowns 1 gramma 1 flame angel.)