The Reef Octopus BR2000SS Space Saver BioPellet Reactor scales the all-in-one BR-SS design up for larger media volumes, with the same built-in water blaster pump so there's no separate feed pump to plumb in. Water injects directly into the chamber for consistent fluidization even as media volume increases. Best for: mid-to-large reef systems wanting a self-contained reactor setup Setup: all-in-one — integrated pump included, no external feed pump required Design: no center pipe for easy lid-off refills, rigid anti-leak sieve plate, cover installs in 4 orientations Step up to the 2000SS from the 1000SS when your biopellet dose has grown past what the smaller chamber can properly fluidize — the taller body gives pellets more room to circulate.Compatible replacement parts: integrated pump kits and sieve plates for the BR2000SS.