MagTool Aquarium in-Sump DC Protein Skimmer N100 Plus - Compact Quiet

In this review the MagTool Aquarium in-Sump DC Protein Skimmer N100 Plus is evaluated for reef hobbyists needing a small, powerful skimmer that fits into space-limited sump setups. The bottom-line: this skimmer is best for aquarists with tanks up to 50 to 100 gal who want reliable foam fractionation and near-silent operation without a large footprint. It stands out for its compact 5.0x4.3in footprint, internal 265 GPH DC sine wave pump, and controllable output that produces fine microbubbles while minimizing noise and turbulence.

Key Features

• Compact footprint: The bottom-open outlet and internal pump reduce external space needs to a 5.0x4.3in base, making it suitable for crowded sumps and small cabinets.
• Controllable DC pump: The 265 GPH sine wave pump with needle wheel impeller gives adjustable flow and aeration for tuning skimmate production and skimmer performance.
• Quiet operation: Sine wave motor technology plus a built-in air intake silencer keeps noise low for near-silent continuous use.
• Efficient bubble production: The needle wheel and Cell-cast diffuser create abundant microbubbles and a stable laminar flow for improved protein removal.
• Hybrid-cone reaction chamber: The cone and Bubble Chamber design reduce turbulence so skimmate rises smoothly into the collection cup for cleaner operation.

Who It's For

The N100 Plus is ideal for reef keepers with space-restricted sumps or in-sump installations who need a compact skimmer that still supports moderate to heavy bio-loads. Its controllable DC pump appeals to users who like to fine-tune motor speed and air intake to match livestock and feeding routines.

It is less suited to very large systems where a larger external skimmer would offer greater processing headroom, or for hobbyists who require integrated automatic drain or larger collection cup capacities; in those cases a larger model may be a better match.

Pros & Cons

Pros

• Very small footprint that fits tight sump spaces while still supporting 50-100 gal tanks.
• Controllable 265 GPH DC sine wave pump with needle wheel produces fine microbubbles and adjustable performance.
• Built-in silencer and sine wave technology deliver quiet operation favored by many users.
• Cell-cast diffuser and hybrid-cone chamber reduce turbulence and improve skimmate quality.

Cons

• Limited to sump installations and smaller tanks; not intended as a sole solution for very large or heavily stocked systems.
• Collection cup size and access may be smaller than on larger stand-alone skimmers, requiring more frequent emptying in heavy bio-load setups.

Specifications

Footprint	5.0x4.3in
Recommended tank size	Up to 50 gal (heavy bio-load) - 100 gal (light bio-load)
Pump flow	265 GPH DC
Pump power consumption	7 Watts
Recommended water level	6.5-7.5in
Design highlights	Needle wheel impeller, Cell-cast diffuser, hybrid-cone Bubble Chamber

Our Verdict

The MagTool N100 Plus is a strong choice for reef hobbyists who need a compact, quiet in-sump skimmer that still delivers effective foam fractionation. Its controllable DC pump, efficient bubble production, and noise-reducing design make it good value for small to mid-size systems where sump space is limited and quiet operation is important.

Frequently Asked Questions

What tank sizes is this skimmer suitable for?
The skimmer is rated for up to 50 gal with heavy bio-loads or up to 100 gal with light bio-loads, making it best for small to mid-size reef tanks.

Is it noisy in normal operation?
No; the sine wave pump plus built-in air intake silencer reduces vibration and sound, and customers report near-silent performance.

Does it require a separate air pump or external placement?
No; the skimmer includes an internal DC pump and is designed for in-sump installation with a bottom-open outlet to minimize footprint.