Not to be snooty about skimmers, but in all honesty I'm really suspect about the prism pro handling a 300 gallon system with any effectiveness. My guess is that manufacturers just pull a number out the air when rating their skimmers. For example, i'm using an Aqua C EV 120, a highly thought of skimmer, until my DIY skimmer is done. I'm certain that the EV is a more powerful skimmer than the prism pro, and I think it's rated for something like 150 gallons (maybe less)
Aqua C is reputed to be "conservative" when rating their skimmers. however, I find the EV 120 to be barely adequate for my 100 gallon set up, and on my 45 breeder, the urchin skimmer I had (rated to 75 gallons) was practically useless once the system got pretty heavily stocked.
Now, that doesn't mean that the skimmer won't pull lots of stuff from your tank, but IMO, a skimmer is REALLY doing its job only when it keeps the tank at DOM levels consistent with natural reef water, which ain't much.
Sorry for the skimmer rant; I guess I've been putting alot of time into my new skimmer, and I hope it's worth it! I'm sure the prism pro will do a good job....
Matt



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