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Choosing the Right Tank Size for Your Pet Fish

If you are a neophyte as an aquarium hobbyist, you may think that upkeep for 50 litre tanks is automatically easier than for 100 litre tanks.Being new to the aquarium hobby, you may be tempted to believe that maintaining 50 litre tanks is necessarily easier compared to maintaining 100 litre tanks. This assumption is completely wrong and yet very common. A variety of factors need to be considered when picking the right fish tank size.

Knowledge and Experience

A larger tank will require more than a single filter or even a pump system that is possibly more challenging than a novice aquarist would be comfortable with. If you are experienced in the aquarium hobby and would like to level up and start keeping bigger fish, a large tank is probably the right choice for you. But as a beginner, it should be safe to begin with one of those 50 litre tanks. This size would not be so large that it upkeep becomes a feat, yet it is just big enough for the water volume to provide a buffer against water parameter mistakes you might make as a novice.


Another obvious factor you should consider when determining the right fish tank size is the specie and number of fish you are planning to have. The rule is to give each fish one inch per gallon of water, but if you do follow this guideline, make sure you consider the adult size of the fish, instead of the size they were in when you purchased them. Also know that certain species need more room than the rest, even if they might be of the same size. Smaller community fish will usually be fine in 50 litre tanks or even smaller, but there are some that need a minimum of 200 litres. Furthermore, tank shape can also be a factor for some species. For example, tall-finned species tend to like tanks that are taller than they are wide. While 50 litre tanks would still be 50 litre tanks, what matters to Angelfish is that the water is dispersed up and down instead of side to side.

Tank Upkeep

Most aquariums require less maintenance time if the aquarium is properly installed, so this is usually not a big concern when looking for the right tank size to get. A good filter size will flush out most of your tank water’s waste and toxins, and your filter media will have to be replaced once a month, whether we talk about 500 or 50 litre tanks. To keep tank water quality high, you need to change 10 – 20% of it on a weekly basis.

Other Factors

While transitioning from a smaller tank to a bigger one, you will likely notice a sizeable increase in price. If you want a big tank but your budget is only good for one of those 50 litre tanks or smaller, just get an aquarium starter kit that already includes some of the tank equipment and decor you’ll need or want. If you are only beginning this hobby but want to give yourself some room for growth, pick a tank that is a little bigger than the typical starter tank.

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