BRS has dimensions listed for them:Also anyone know if the redsea skimmmer is bigger than the 150 INT??
RSK 600 Reefer Internal Protein Skimmer
Protein Skimming Reinvented Efficient | Quiet | Ergonomic Red Sea Recommends for tanks up to: Light Bioload - 450 gallons Medium Bioload - 300 gallons Heavy Bioload (most common) - 150 gallons Red Sea Reefer Internal Protein Skimmers are designed with the hobbyist needs in mind. From...
Protein Skimmers
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Looks like the RO 150INT is in between the RS 300 and 600 as far as tank sizing goes...

