![]() ![]() The above calculators give a maximum stock level, which only applies if the aquarium filter is working in a fully matured state. ![]() As an example, 10 neons collectively have a stocking size of 30cm, assuming a size of 3cm each, but would require much less feeding and produce much less waste than a single large 30cm fish. This is because proportionally, big fish have more mass and produce more waste, requiring more filtration. Stocking guides are for small to average size fish (up to 10cm), for larger fish stocking levels need to be reduced. ![]() Enter your tank length below to work out your maximum fish size No aquarium should be less than about 20cm square. For a detailed explanation of why some are right or wrong, take a look at our article on Stocking levelsĪ very rough rule for maximum fish size is that to provide enough swimming space the aquarium should be at least 6 times as long as the fish when fully grown, and at least twice as wide. Look around and you can easily find lots of conflicting opinions about stocking levels. 'up to 200L' filter in a 100L tank)Įxternal (+10%) - Large external filters which sit underneath the tankĮxternal plus (+15%) - Large external filters rated at up to twice the volume Internal plus (+5%) - IF rated 2x volume (e.g. Internal (+0%) - Internal Filter (IF) which sits inside the tank or hood Undergravel (-20% less stocking capacity) Stock level in CM for different filter types: For each different type of filtration, the formula is adjusted accordingly. Starting with a basic internal filter, the same formula is used. Stocking calculator 3 - Volume & Filtration (Best, recommended)īy adding a few variables to the 'stocking by volume' calculator, it is possible to get a much more useful figure. However, if your tank is deeper or shallower, using this guide by volume will give you a more accurate stocking figure.įormula: 1cm per litre / 2inches per gallon ![]() If your aquarium is 30cm deep (12") the results will be the same as the surface area formula above. This very roughly converts to 1cm per litre. Use our Surface Area Calculator to work out your surface areaįormula: 2.5cm (1") of fish for every 75 sq cm (12 sq in) of surface areaĮnter your surface area below to calculate your stocking level.Ī formula for stocking by volume of 2" per gallon is widely used amongst fish keepers. We recommend avoiding this method and using calculators 2 or 3 below. Modern filters make this formula redundant since they agitate the water, allowing a much larger gas-exchange. This formula has been around since the 1960's (before many tanks even had filters) and is based on the surface area required to allow enough oxygen to enter the water. Stocking calculator 1 - Surface Area (Not recommended) Always use the size of your fish when fully grown.īelow are three calculators to give you a rough idea of stocking levels. When talking about the size of fish, the tail is excluded. How many fish your aquarium can support depends not just on the size of your tank but a range of factors including the type and quantity of food, waste production levels, filtration, maintenance, plant growth, and even the mass/weight of your fish.Īs it would be too difficult to measure all these, we have to use imperfect rules to guide our stocking levels. Author: Think Fish Last updated: 2 July 2019 18:52 Stocking levels aquarium and fish tanks ![]()
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