Reef Octopus vs Nyos skimmer comparison
Compare two specific in-sump models: the Reef Octopus Classic 150INT and the original Nyos Quantum 160. These published specifications help check cabinet and sump fit; they do not establish which skimmer removes more waste or runs quieter in your tank.
Exact models and sump fit
| Check | Reef Octopus Classic 150INT | Nyos Quantum 160 |
|---|---|---|
| Model | Classic 150INT (CLSC-150INT) | Quantum 160, original model (not EQ) |
| Footprint | 12.4 × 8.7 in | 18.5 × 25 cm (about 7.3 × 9.8 in) |
| Total height | 22 in | 53 cm (about 20.9 in) |
| Sump water depth | 6–8 in recommended | About 21 cm / 8 in per the manual |
| Pump / published power | Aquatrance 2000s / 18 W | Quantum 3.0 / 18 W |
| Manufacturer tank rating | 110 gal heavy, 150 medium, 210 light bioload; excludes sump | 250–1,000 litres; not the same bioload rating system |
| Access | Quick-release cup neck; union pump mount | Allow at least 5 cm / 2 in at pump suction side; body must clear sump walls |
How to interpret these specifications
Specifications checked September 10, 2026. Nyos dimensions are converted from its metric measurements; rounded inches are for orientation, not a cutting template. Confirm the exact model and revision before purchase.
A body that fits on paper may still be impossible to service. Measure the cabinet opening, room to lift the cup, access to controls and the route for removing the whole unit. The listed heights do not include a verified cup-removal allowance.
Example: in a 12-by-10-inch chamber, the Classic's 12.4-inch side fails a simple axis-aligned fit check. The Quantum's nominal base fits, but that alone does not establish enough intake or maintenance clearance. Check a full-size template and the manual before buying.
These models illustrate physical tradeoffs, not equivalent tested capacity. For a lightly stocked 75-gallon system, first decide whether either is larger than needed. The sizing calculator is a planning aid, not a performance test.
Choose Reef Octopus skimmers when
- Your sump can provide the specified 6–8-inch operating depth and enough space for the external pump and controls.
- The bioload-specific manufacturer rating is a useful starting point for your stocking plan.
- You have verified a local supplier for the exact pump and replacement impeller.
Choose Nyos skimmers when
- The smaller base helps your layout while still leaving the manual's intake clearance and service space.
- Your skimmer chamber holds the recommended water level consistently.
- You have confirmed parts for the original Quantum 160 rather than assuming an EQ part is interchangeable.
Where to buy
Confirm the exact model, size and bundle on the retailer page before ordering.
Reef Octopus Classic 150INT
Check price at AmazonReef Octopus Regal 150SSS
Check price at Bulk Reef SupplyNyos Quantum 120
Check price at Bulk Reef SupplyNyos Quantum 220
Check price at AmazonSome links may earn ReefCrafter a commission at no extra cost to you. Learn how ReefCrafter is funded.
Fit math
- Start with display gallons and bioload, then compare the model's realistic rating against the skimmer multiplier.
- Measure sump chamber footprint, water depth, cup clearance, and service access before comparing brand preference.
- A heavy bioload needs export headroom; a lightly fed reef may be better served by stability gear than a premium skimmer.
Risks before buying
- Oversizing can make tuning inconsistent when the tank does not produce enough waste for the skimmer body.
- A physically awkward skimmer becomes a maintenance problem even when the rating looks correct.
- Do not let brand loyalty hide pump replacement cost, warranty path, or current model availability.
- Compare delivered price, any required stand, and replacement-pump cost with your retailer. No live price, stock status or measured noise comparison is claimed here.