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Selecting the Appropriate 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 very common and yet very inaccurate. There are factors to be considered when selecting the right tank size for your pet fish.

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 have years of experience with this hobby and are planning to start having larger fish, a big tank may be good for you. However, if you’re a beginner, starting with one of those 50 litre tanks could be wise. This size would not be too big that it becomes a feat to maintain, yet big enough to give you a buffer against water parameter mistakes you could make being 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. As well, take note that certain species require more space than others, whether or not they are of similar size. In general, smaller community fish can do well in 50 litre tanks , but others may need no less than 200 litres of water. In addition, note that some species may also prefer a certain tank shape. For instance, tall-finned species like Angelfish tend to appreciate tanks that are more vertically spacious than horizontally. 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 eliminate most of the toxins and waste from your tank water, and you will have to get a new filter media once a month, no matter if you’re talking 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

As you transition from smaller to bigger tanks, you will observe a significant increase in price. If you want a large tank but only have money for no bigger than one of those 50 litre tanks or smaller, consider getting an aquarium starter kit that comes with some of the equipment and tank decorations. If you’re just starting this hobby but you’d like want to give yourself a little room for growth, for a tank that is slightly bit bigger than your average starter tank.

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