The Mighty Aquarium Filter HOB is a compact, hang-on-back filtration system available in five distinct sizes engineered for freshwater tanks ranging from 1 to 24 gallons. Designed for quick rim mounting, this unit delivers clear, oxygen-rich water while keeping operational noise to an absolute minimum. It is the ultimate plug-and-play filter for aquariums, offering beginner-friendly maintenance, an integrated leveling knob, and adjustable flow control for nano aquascapes and betta setups.
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Always verify rim thickness and filter clearances behind your tank before final installation.
| Model | Dimensions | Max Flow Rate | Power | Tank Size Compatibility | Recommended UNS Tank |
|---|---|---|---|---|---|
| XS (MG02) | 3.27 x 3.15 x 4.33" | 15.86 GPH | 4W (AC110-120V / 60Hz) | 1–3 Gallons | UNS 20C |
| S (MG04) | 4.01 x 3.31 x 4.57" | 31.07 GPH | 4W (AC110-120V / 60Hz) | 2–5 Gallons | UNS 3N |
| M (MG08) | 5.00 x 3.78 x 5.20" | 63.40 GPH | 4.5W (AC110-120V / 60Hz) | 4–10 Gallons | UNS 30C |
| L (MG12) | 5.71 x 4.33 x 5.71" | 120.00 GPH | 4W (AC110-120V / 60Hz) | 10–16 Gallons | UNS 45U |
| XL (MG20) | 7.44 x 5.20 x 7.13" | 170.00 GPH | 6W (AC110-120V / 60Hz) | 15–24 Gallons | UNS 60U |
1. How do I choose the best aquarium filter size for my nano tank?
A reliable rule of thumb for selecting a filter for aquariums is aiming for a turnover rate of 4 to 5 times your total tank volume per hour. For instance, a 5-gallon nano aquarium performs best with a small or medium HOB filter operating between 25 to 50 GPH to maintain mechanical filtration and water polishing without overwhelming small nano fish.
2. Why is my HOB filter making a rattling noise, and how do I fix it?
Vibration against the tank rim is the primary cause of noise in hang-on-back filters. Rotating the integrated leveling knob at the bottom back of the filter body until the unit sits completely vertical and flush against the glass dampens operational vibration and restores whisper-quiet performance.
3. How can I make my HOB filter intake safe for baby shrimp and fry?
Slipping a high-density pre-filter sponge or mesh guard over the intake tube prevents tiny dwarf shrimp, fry, or small snails from getting pulled into the impeller housing. This simple addition keeps delicate livestock safe while capturing large debris before it clogs your internal cartridge media.
4. How often should I replace or rinse my HOB filter media?
To preserve your beneficial bacteria colonies, rinse mechanical sponge inserts gently in squeezed-out aquarium water during routine water changes rather than using chlorinated tap water. Replace clogged filter cartridges every 3 to 4 weeks to ensure peak water clarity and prevent restricted intake flow.
Overall rating: 4.571429 / 5 from 56 reviews.
The Mighty Aquarium Filter HOB series offers essential filtration for nano aquariums, available in various sizes. It is praised for being quiet and easy to maintain, with adjustable flow and a leveling knob for stability. Replacement media is included, and additional sets can be purchased for longevity.
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"Great looking filter that is easy to use. Fits with my Top Fin 3gal shrimp and plant tank. I cut a small piece of sponge to cover the filter intake fully, because there is a hole with the provided sponge. The leveler and water flow adjuster are great features for such a cheap filter. I put some old ceramic rings in there to kickstart it, since my old filter broke."
"I am enjoying this filter for my 5. 5 gallon betta tank! My only criticism is the lid on the filter can rattle sometimes making it a little bit louder than I'd like."
"Havent used it yet. Its really small and wont fit on a rimmed tank"
"A Great little hang on the back for nano and long tanks."
"It is a very good hob filter"
"Small, quiet filter that was easy to set up. So far running well!"
"I bought the smallest one, and it has excellent flow; it is very quiet, and—despite being made of plastic—it looks to be of good quality."
"Greet little HOB Filter didn't really use the media that came with it. Only the coarse sponge. I added my own fine filter floss and Bio pellets. But it is small relatively quite and a great deal for the money."
"great little hob, got a the XS for a diy purpose, used a dremel tool to cut the intake short, attached the intake attachment with the grate and it was then short enough to sit on my UNS . 5 gallon, with custom media in the chamber it's perfect"
"Rattles and makes some noise"
