Best Skimmer under $250 for a medium sized tank?

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Can anyone tell me the difference between the Reef Octopus INT 150 and the Reef Octopus NWB 150? It looks like the NWB has a needle wheel pump, but I can’t find anything that says what kind of pump the INT has.

Same unit just referred to differently. Classic NWB 150 INT is the official name and INT stands for Internal as they also have an external unit.