![]() Now, calculate the inches of tetras your neon tetra 20-gallon tank can support with the following formula: However, according to what I’ve read, their average height is 9-12 mm (0.35-0.47) inches in length. Then take a conservative approach and assume the neon tetras are 1 inch tall. Let’s calculate the stocking numbers for a 20-gallon high tank and a 20-gallon long tank, both of which have dimensions of 24″ x 12″ x 16″. ( the total inches of fish the tank can hold/fish’s height). To calculate how many fish your tank can hold, divide the answer from the previous by the height of your fish. To calculate the total inches of fish the tank can hold, divide the surface area by 12 (surface area / 12). This gives us a surface area of 288 square inches (30×12). In our case, a 20-gallon long tank would be 30 inches long and 12 inches wide. To do that, multiply the tank’s length by its width. So, to properly apply this rule, we need to find the tank’s surface area first. This is because oxygenation happens at the top, while bacteria degrade fish faeces at the bottom. They claim we must consider the aquarium’s surface and floor space while calculating the stocking number. Later on, most experienced fishkeepers adopted this regulation as their go-to guideline. In his well-known book, You and Your Aquarium, famed fishkeeper and author Dick Mills established a different stocking rule. You can either round that number up to 12 or 11 when stocking your aquarium. ![]() Therefore, a 20-gallon tank could comfortably hold 11.42 (20/1.75) tetras. Generally, neon tetras grow to be 1.5 inches (4 cm) long, but for the purposes of this equation, we will assume they are 1.75 inches (4.45 cm). A 20-gallon high tank has less surface area than a 20-gallon long tank and can support fewer fish. This rule also doesn’t consider the different types of fish tanks. Imagine being crammed into a tiny room with 30 other people – not fun, right? This rule will create an overstocked, stressful tank environment for larger fish. However, you can apply this rule to only fish smaller than 3 inches. This is because it overlooks the fish’s height, weight, and activity level. So, what would the stocking numbers look like if we applied these standards? Let’s take a look! The 1 Inch Per Gallon RuleĪs I mentioned, the one-inch-per-gallon rule is debatable in fishkeeping. Two examples are the argumentative “one inch per gallon” rule and the more forgiving “12 square inches of surface area for every inch of body length”. To determine the number of fish to stock, hobbyists adhere to a few regulations. For example, a 20-gallon long tank can accommodate more neons than a 20-gallon high tank because it has a larger surface area. However, if you’re an experienced fishkeeper comfortable with overcrowding, 30 is perfectly feasible.Īlso, the stocking number for your tetras depends on your tank type. 10 is a safe start for a beginner fishkeeper. I realize the range is broad, but let me try to shed some light on it. How many neon tetras can live in a 20-gallon aquarium? How do they interact with other fish? What do they like to eat? Keep reading to find out! How Many Neon Tetras Can I Put in a 20-Gallon Aquarium?Ī 20-gallon tank can support anywhere from 10 to 30 neon tetras. However, this is not always the best option, as neon tetras are small and need space to swim and hide.īut don’t worry, I’ve got all the answers to your burning neon tetra questions from personal experience. This means that a 20-gallon tank could theoretically hold 20 neon tetras. In general, a good rule of thumb is to stock one inch of fish per gallon of water. How many neon tetras can you put in a 20-gallon tank? The answer largely depends on the other fish in the tank and the maximum size and personality of the neon tetras. Neon tetras are a piece of the puzzle when it comes to stocking a 20-gallon aquarium.
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