Ive read that bubble kings skim better when they are worked harder. I had a mini 200 on a 215 gallon and sold it for a atb 1050a, I personally don't think the bubble kings are worth the extra $ over say ATB, in my experience they are built just as nice if not nicer, parts are much much easier to get in a crunch and customer service is outstanding. I also replaced a bubble king supermarin 300 with a reef octopus 5000 internal cone filter which by the way also does a better job for a 1/4 the price. I had a snail snap the impeller on the larger pump for the supermarin 300, took 6 weeks to get a replacement. I recently emailed atb to get a float valve for my skimmer cause i wanted an extra safeguard for overflows....paypaled on monday received on thursday, from california & i live in ohio.