Tanks without a sump don't have to skip real protein skimming — a hang-on-back design brings a genuine reaction chamber to any tank with an accessible back panel. The Reef Octopus Classic HOB Protein Skimmer line spans four sizes, so you can match real skimming capacity to your tank without building a sump.
Why HOB Skimming Works
A hang-on-back skimmer draws water from the display, runs it through a proper reaction chamber and pump, and returns it — giving sump-free tanks the same fundamental skimming process a sump-based skimmer uses, just packaged to mount on the tank itself.
Choosing a Size
- Classic 90 HOB — the entry point for smaller tanks that still want real skimming rather than relying on filtration alone.
- Classic 100 HOB — a step up for larger single-tank setups needing more skimming capacity.
- Classic 1000 HOB — one of the most established hang-on-back skimmers in the hobby, suited to mid-size tanks.
- Classic 2000 HOB — the largest hang-on-back model in the Classic Series, for aquarists without sump access who still want to skim a bigger tank.
Setup Tips
- Check clearance behind the tank before ordering — HOB units need room to mount and access for cup emptying.
- Break in gradually, since new skimmers commonly overflow with microbubbles for the first 1–2 weeks until they season.
- Empty the collection cup regularly rather than letting skimmate sit and potentially drain back into the tank.
The Reef Octopus Classic HOB Protein Skimmer line is available at Marine Concept Supply across all sizes — order online or pick up at our shop in Wheeling, IL. Shop Classic 90, Classic 100, Classic 1000, or Classic 2000, and browse more protein skimmers.
