Marineland Penguin 350 Review: Keeps Your Aquarium Healthy?

Keeping a healthy aquarium has everything to do with the quality of water that runs through the facility. This is why a reliable filtration system is essential to get rid of contaminants and make the water habitable and pure enough for your fishes.

Given the huge number of canister filters in the market, finding one that will best serve your purpose can be somewhat overwhelming, especially if you’ve never purchased one before.

If you are looking for a good match for your tank size that has got all the bells and whistles, but without a hefty price tag, then you might want to consider the Marineland Penguin 350 Filter.

The Marineland Penguin 350 Filter boosts of many interesting features that makes it a favorite for many who are into fishkeeping either for fun or as a source of income.

Although, it is ideal for supporting lightly stocked tank, it also works well to for fish tanks with higher bio-loads such as cichlid and goldfish tanks. You will find it extremely useful for a wide variety of aquarium setups.

It gives you a lot customization options to enhance the filtration of your tank or aquarium. For instance, you can complement the filter performance by adding extra bio-filtration. It is very common for some homeowners to add some extra bio-balls and inserts.

The machine is durable and hardly ever suffers from catastrophic leaks. It retains its flow rate even when it’s dirty and operates quietly.

MarineLand Penguin 350 Power Filter
  • WITH ROTATING BIO-WHEEL: Patented Bio-Wheel technology provides excellent wet/dry biological filtration.
  • MULTI-STAGE FILTRATION: Delivers mechanical, chemical and biological aquarium filtration to maintain a clean aquatic environment.
  • COMPATIBILITY: Use with Marineland Rite-Size Filter Cartridges (see individual filter for sizing recommendations).
  • FIVE SIZES: Available in 75 GPH, 100 GPH, 150 GPH, 200 GPH and 350 GPH sizes.
  • age range description: All Life Stages


  • Durable construction
  • Does not take up any space inside aquarium
  • Has a spacious interior
  • Good flow rate
  • Easy to use


  • Can be a bit noisy
  • Needs a lot of clearance

Large Filter Capacity

The Marineland Penguin 350 Filter is rated to serve aquariums and fish tanks with 50 – 70 gallon capacity. This means it should work well for lightly stocked tanks or aquariums with capacity not more than 70 gallons.

According to the product specification, the filter can process up to 350 gallons of water in one hour. What this implies is that if you have a tank that has a capacity of 50 gallon, the Penguin 350 will process all 50 gallons of water seven times within one hour. Isn’t that impressive?

You don’t come across a filter with such a feat in the market every day.

Efficient Performance

This unit also boosts of having an outstanding filtration efficiency. It utilizes multi-stage filtration to produce clean and clear water. The filtration cartridges are very easy to use and replace when dirty.

marineland penguin 350

Both mechanical and chemical filtration is performed at the same time to enable complete removal of solid debris, chemicals, and toxins. The process also takes care of odor removal resulting in a fresh clean aquatic environment that is safe for your guppies.

In the case of solid debris, a strainer is used to ensure that the actual filter doesn’t get dirty and used up very quickly.

To cater for biological filtration, the machine is equipped with a patented bio-wheel which introduces beneficial bacteria that to remove harmful chemicals like ammonia and nitrates.

The only aspect of this unit you may not find interesting is that it doesn’t come with a filter indicator. This means it won’t tell you when you need to replace the filters. It’s left to you to realize the filters are due for replacement by mere looking at them.

Easy Installation 

This unit comes with a Hang-on-back feature that makes it very easy to install. All you need to do is to hang it on the back of your aquarium or fish tank, then fasten with the clips provided, and you are good to go.

Apart from the ease of installation, a hang-on-back filtration is more desirable because it is positioned outside the fish tank, not inside. In other words, the amount of space available to your fishes and plants will not be reduced by a filter inside the tank.

Having said that, you will need about 5/6 inches to fit the unit behind your aquarium or fish tank.

However, it’s important to note that this filter needs to be manually primed, which might be inconvenient.

Good Aeration

Apart from its high durability, one of the main selling points of this filter is the fact that it provides strong aeration for your fish tank.

Since fishes need oxygen to breathe, having a lot of it down there is really essential.

The machine comes with small waterfalls that are positioned on the sides to direct filtered water back into the aquarium. This process helps to make more oxygen available at the depths of the fish tank.

This is extremely important especially if you’ve got a lot of guppies.

However, it’s also important to know that the waterfalls can be a bit noisy.

Frequently Asked Questions

How many is contained in a pack?

Just one.

Will it work on the emperor 400?

No, definitely not. It only fits for penguin 200 and 350 model filters respectively.

Can bags of media fit inside?

No, bags will fit because of the slots.

Will the cartridge media fit the penguin 150 filter?

No, it won’t fit.

What’s the content?

It contains a sheet of polyester filter media and a few spoon gulls of activated charcoal.

The Bottom Line

Overall, the Marineland Penguin 350 is a great filter for the money. It works well for both novice and experienced fish keepers.

Although it requires some clearance to setup, it possesses a high processing power many filters in its category cannot rival. As long as you are able to get pass the little noise, you should find it adequate to meet your aquarium filtration needs.

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