I have a Super Reef Octopus 3000 internal. It's got the water blaster pump on it, not the newer diablo DC motor.
It's completely silent. I don't hear air sucking in, I don't hear water moving around, it skims really really well, and pulls tons of junk out of the water.
I've only owned SRO skimmers, so I can't comment on others... but I really like mine.
I know SRO is spendy, but imo this was worth it.
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