Fluval 306 vs 406

Fish is one of the high maintenance pets to have at home because they need a proper care especially on the environment to support their life. One equipment we must have when keeping fish is the water filter because their function is to help cleansing the water so they can thrive inside the aquarium. For those with medium to bigger tanks, Fluval 306 vs 406 are two great models to choose with a fairly big capacity but, see how they are separated first before shopping.

In this article, we are going to give you information about:

  • Why do you need a filter 
  • What are Fluval 306 and 406
  • What Fluval 306 and 406 Look Like
  • How much are the capacity of Fluval 306 and 406
  • What else Fluval 306 and 406 can offer to you
  • Fluval 306 vs 406

Fish Tank Filter 

Many of us loves animals and live with them inside the house but when talking about what animals often being kept at home as a pet, dogs and cats will be reigning at the top since they are friendlier with humans and already domesticated since our predecessors era. However, we have so many options when it comes to pet since as long as they are legal and able to live in our environment. Taking a proper care of them is still possible even though some of them can be very high-maintenance.

Among those animals we used to keep at home as a pet, fish is another exotic choice for those who prefer this aquatic animal. What you need to keep in mind is keeping fish unlike animals like dogs or cats, will require more efforts since we have to provide a different environment in which the goal is to mimic their natural habitat; as close as possible. Some mistakes can be very intolerable and can kill our fish just in hours so make sure to check their necessary requirements.

This is why people always recommend to spend your time in considering the type of fish to keep because different kind may need different care as well and to ease hobbyist, beginners are often go with freshwater fish because not only they are sturdier, requirements are also generally easier. When you already decide what kind of fish to keep, next step is buying a tank and contrary to popular belief, a bigger tank is easier to manage since more water means easier to maintain.

When you are done building the tank with everything you need to provide a proper equipment, one we can’t miss is the water filter because both fresh and saltwater setup will need this machinery to run and cycle the water. On their core, aquarium filter function is to help maintain clean and safe water for the fish as well as invertebrates and plants we put inside. As you may know, the beneficial bacteria that convert ammonia from excretions which produce nitrite that can harm your fish.

When looking for a fish tank or aquarium filter, the first thing you may want to consider first is their size because many people recommend users to find those which capability can cycle water 4 times each hour. If your fish is fine with high water flow, it is always best to go with a more powerful one since the saying about there is no such thing as over filtering is indeed true in most situations.

About Fluval 306 and 406

If you are ready to get a filter for a fish tank, besides the capacity we should also pick the type because what we are talking about above are mainly for box canister and there are also those internal filter we can submerged or hang on the back such as Fluval C3 Vs C4. In general canister filter or external filter is used for a bigger tank since they also have more powerful pump to cycle the water inside. Among those many brands that offer fish tank filter, Fluval is one of the best options to go.

This brand has been around for quite sometime and we are sure most hobbyist are already familiar with their names as well because many people love their product which mostly reliable and coming in a competitive price compared to its rivals. We also like them for the features equipped on the unit since some are very useful and ease the work, so we can spend less effort especially on the maintenance activity. They do have a wide options but, if you are here, a machine for a bigger tank seems what fits the most.

Besides the C line which is packed with hang on the back filter, Fluval also have many other filters depend on what you need but, if your tank capacity is 50 to 100 US gallons, two of the best options will be Fluval 306 and 406. As their names suggest, these models are brothers, close brothers to be exact with few other filters on the same family and what sets them apart the most will be the capacity ranging from the pump we can use up to 25 gallons to those we can use up to 100 gallons.

Many people may be attracted to get the strongest model and while it is all up to how you want the performance in cycling water, a stronger filter will be more expensive as well and if budget is among the top things to consider, those that can handle your amount of water should be enough. 

Fluval 306 and 406 Design

As you can see from the sample picture above, both of them are coming with an identical design and if you check the whole family, they are actually also made with this same boxy design with the model name plastered at the top. However, when you place them side by side, the latter will be bigger or taller to be exact because Fluval 406 is measured at 20-inch as opposed to 18-inch Fluval 306. The latter is also slightly wider at 8-inch while the little brother is 7-inch yet the length stays the same.

Unlike some popular box filters from Eheim for example which is made from stainless steel and quite heavy to move around, Fluval is making their products from plastic but it is very thick and sturdy enough to be used for a prolonged time. Coming inside the package we have all the accessories needed to install your filter from media and pads to strainer and connectors which equally the same in either of them.

Fluval 306 and 406 Capacity and Pump

Before deciding on which model you should go with, first make sure to know how much water in your tank and if you don’t measure them beforehand, a quick way is to multiply the tank’s length with width and height then divide them to 1000 to get the size in liters but, these sizing have to be in cm first. Moving forward then we can match how big the pump needs to be for the tank by multiplying this amount to 4.

Fluval 306 and 406 are listed for up to 70 and 100 gallons respectively or up to 300 liters and 400 liters so this sizing alone can already tell us who should use the more expensive model and who should be fine with the lower pump. Not only is the capacity, 406 filter also featured with a stronger pump to get an output of 383 gallons per hour compared to 303 gallons per hour on 306 filter. 

This filter have a higher water circulation per hour as well at 245 gallons per hour and the other is at 306 gallons. If you are still not sure, the smaller filter is suitable for people with 45 to 70 gallons and above this number up to 100 gallons will match with the higher filter.

Fluval 306 and 406 Features

On the additional features side, both of them are packed with the well-known AquaStop valve which is used to connect the canister and your hose which is adored by so many people because it is extremely easy to install and use. It comes in a plastic with two connectors and a clamp to lock them in securely. The hose also attached to nuts so then owners don’t have to fear of losing them that can happen after being used for a long time.

The next attractive feature from this valve alone is the white lever which is functioning as the water flow adjustment so when we are moving this lever up or down, it will affect how strong or slow the water flow through the valve; very useful when you need to maintain or try customing the flow according to each tank’s need. We also like how easy it is to lock the head of these canister to the main body with a simple clamp on each side.


Now, let’s compare Fluval 306 with 406. Both of them are identical filters and being a close brothers makes them have the same capabilities but is also different in capacity because the latter should be used with bigger tank from 70 to 100 gallons while the little brother is meant for those with smaller tank from 45 to 70 gallons. This is due to their bigger form as well which affect how the water flow inside combined with stronger pump.

Fluval 306 vs 406

- Multi-stage filtration for healthy fresh & saltwater aquariums
- Suitable for aquariums up to 70 gallons
- Sound dampening impeller design for a quieter operation and head height (max.) is 5.8 feet
- Multi-stage filtration for healthy fresh & saltwater aquariums
- Suitable for aquariums up to 100 gallons. Flow Rate: 1450 LPH (383 US GPH)
- Built with a patented Aquastop Valve, multiple filtration baskets, and rim connector assemblies; 3 year warranty.Media Capacity: 8.5 L


All in all, the decision is all yours to make because not all of us are going to have the same tank sizes or capacity but until this part, we are sure readers can already decide which model to go with their filter and in case you are using them for 70 gallons tank we do recommend users to choose the bigger filter.