HOB-1.5 Hang-On-Back Protein Skimmer

In stock
Out of stock

Discontinued by Bulk Reef Supply
- +

The AquaMaxx HOB-1.5 is an upgraded and more-powerful version of AquaMaxx`s best-selling HOB-1. With an enlarged bubble diffusor and reaction chamber, the new HOB-1.5 is able to fully harness the power of the Shark 1.0 pump to maximize foam production and protein extraction. The custom conical bubble diffusors help minimize the turbulence inside the reaction chamber and help to direct water linearly up toward the collection cup. More waste than ever is pulled out of your aquarium and into the easy-to-remove collection cup.

AquaMaxx skimmers are computer-precision engineered and utilize the latest filtration technology to deliver the performance and value you are looking for in a protein skimmer.

AquaMaxx HOB-1.5 protein skimmers are easy to setup and maintain. Just move the collection cup up or down to adjust the foam level to wet or dry.

Maintenance is simple. A removable collection cup makes cleaning easy. Plus, every AquaMaxx protein skimmer includes a drain fitting for hobbyists who want to setup a separate reservoir for skimmate.

Water quality and consistency is crucial to the success of a marine aquarium. An AquaMaxx HOB Series I protein skimmer will help to ensure that success.

AquaMaxx protein skimmers were designed from the ground up with the hobbyist in mind. AquaMaxx HOB Series I protein skimmers have the pump placed inside the skimmer itself to save space, reduce noise and improve efficiency.

All AquaMaxx protein skimmers are computer designed. Each unit is precision-cut and made of polished cell-cast acrylic.

AquaMaxx HOB-1.5 Skimmers feature high-quality Italian-made Sicce pumps. Each Sicce pump motor block is then modified and fitted with proprietary AquaMaxx needle wheel impellers. With the precise modifications and upgrades, performance is boosted much beyond that of a stock pump. The upgraded AquaMaxx ‘Shark’ pump is capable of drawing in significantly more air and chops them up to the optimum bubble size for protein extraction. These pump and protein skimmer combinations deliver unprecedented performance and reliability. Accumulated protein and organics will be vigorously removed from your tank so you can focus less on maintenance and more on enjoying your piece of the reef.


  • Modified and upgraded Italian Sicce needle-wheel pump produces optimum bubble size for high-efficiency protein skimming
  • Efficient, durable and reliable
  • Simple to set up and operate
  • Cell-cast acrylic construction


  • Dimensions: L 7.5 x W 3.5 x H 17 Inch
  • Pump: AquaMaxx SHARK 1.0 (modified and upgraded Italian Sicce pump)
  • Pump power consumption: 11 Watts
  • Outlet size: 3/4 Inch
  • Minimum tank height 10-7/8"
  • Filtration Rating: up to 75 Gallons (light bioload) or 40 Gallons (heavy bioload)
  • Requires approximately 4" of clearance to remove collection cup.
  • Fits aquarium rims up to 3/4" thick.

All of our products are backed by a 60-day return policy although the skimmers will also carry a 1-year manufacturer warranty from AquaMaxx. Each skimmer will include detailed instructions and diagrams to help hobbyists get up and running immediately.


No sump, no space? No problem! These hang on back skimmers are the perfect solution for any aquarium. Proven and reliable, these hang on back skimmers continue
to impress with their high quality Italian made pumps. They are by far MD`s top sellers and for good reason, they skim well and are easy to clean.




Bullet-1 HOB

Footprint (In.) 7.5" x 3.5" 17.25" x 3.94" 8.75" x 5.5" 4.9" x 3.1"
Height (In.) 17" 14.18" 20" 11.4"
Motor Shark 1.0* Shark 1.0* Shark 1.5* Shark Nano*
Gallon Rating Light Bio-Load: Up to 75g Up to 60g Up to 175g Up to 30g
Medium Bio-Load: ~60g ~40g ~130g ~25g
Heavy Bio-Load: Up to 40g Up to 20g Up to 90g Up to 20g


Built small and tough as their full-size counterparts. Equipped with Italian made pumps, they skim the heck out of nano aquariums and are quiet. They`re definitely not
toy skimmers.



Bullet-1 HOB

Footprint (In.) 2.76" x 4.15" 5.9" x 3.2" 4.9" x 3.1"
Height (In.) 13.39" 14" 11.4"
Motor Shark Nano* Shark 1.0* Shark Nano*
Gallon Rating Light Bio-Load: Up to 30g Up to 65g Up to 30g
Medium Bio-Load: ~25g ~50g ~25g
Heavy Bio-Load: Up to 20g Up to 30g Up to 20g

*Denotes Modified Italian-made Sicce Syncra pump

More Information
UPC 638346946296
Manuals Instruction Manual
Skimmer Type Hang On Back
Capacity Light Bioload - Up to 75 Gallons
Medium Bioload - Up to 58 Gallons
Heavy Bioload - Up to 40 Gallons
Dimensions 7.5"L x 3.5"W x 17"H
Max Tank Thickness 3/4 in.
Output Size 0.75" (3/4 in.)
Pump Model AquaMaxx SHARK 1.0 (modified and upgraded Italian Sicce pump)
Pump Rotor Type Needlewheel
Variable Speed No
Power Type AC
Power Consumption 11 Watts
Additional Notes Requires approximately 4" of clearance to remove collection cup
Requires a minimum tank height of 10-7/8"
Pump Included Yes
Write Your Own Review
You're reviewing:HOB-1.5 Hang-On-Back Protein Skimmer
Your Rating
Only registered users can write reviews. Please or

Product Questions

I know it isn't rated for 125 gallon, but i have an extremely lightly stocked 125 gallon top fin tank. will it fit over the lip of that tank? If not, is there another HOB that woould?
Question by: Clifford Hartley on Feb 3, 2023, 3:38 PM
Thanks for reaching out! Fits aquarium rims up to 3/4" thick.
Answer by: James Johnson (BRS Staff) on Feb 17, 2023, 11:31 AM
This is too much for a 29 gallons
I see the others skimmer but I like this one
The in sump skimmer don’t work for me ( esthetic razón)
Question by: Rodrigo on Dec 9, 2022, 5:30 PM
This skimmer may work for your application depending on bioload. Another option to consider and check the mounting requirements is found below. The nice thing is the skimmer below has more than one function and still performs very well for smaller aquariums.


Answer by: Rick Pucciarella (BRS Staff) on Dec 15, 2022, 2:13 PM
Can i attach a CO2 scrubber to this protein skimmer?
Question by: Hannah Harvey on Nov 26, 2021, 6:40 PM
Hello, yes you can. The scrubber air tube would need to be installed on the Skimmer's Air Intake pipe at the top of the skimmer. Happy Reefing.
Answer by: Christian (BRS Staff) on Nov 28, 2021, 12:51 PM
Will this type of skimmer work a Marineland glass aquarium with typical plastic rim? My tank size is 75 gallons.
Question by: Benito Lubrano Jr. on Nov 9, 2021, 12:23 PM
This fits aquariums with rims up to 3/4" thick.
Answer by: Matt Lucero (BRS Staff) on Nov 9, 2021, 12:27 PM