Aquarium Dimensions and Weights - The Spruce

Input your tank size (5 gallons) and then your fish (12 guppies) and see what it says.
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Yes, there is such a thing as freshwater puffer fish! In fact, there are several species of freshwater puffers, but this one is the smallest (and the cutest!) and can be kept in a tank as small as 5 gallons. Pea puffers max out at just over an inch in size and should only be grouped with each other, small catfish, and small gobies such as the bumble bee goby. Despite their very tiny size they can be quite aggressive and do not make suitable tankmates for other small, free-swimming fish and can be difficult to house with larger species as well. Pea puffers can also be aggressive towards each other and care should be taken to house a 1:2 ratio of males to females and no more than 3 puffers should be housed in a 5-gallon tank.
with a 75-gallon tank, 12 Oscar's (approximately 4” in size) and a Pictus Cat fish.
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- David decided to try this experiment with a 75-gallon tank, 12 Oscar’s (approximately 4” in size) and a Pictus Cat fish. He started the experiment with a cycled filter and an absolute bare tank (no substrate). Every day he would clean the tank out, bringing the water level right to the bottom. The Oscars were literally lying on their sides. He said the first time he did this they were freaking a little, but after the first time they actually reacted as if they were excited to get the fresh water. He would then fill the tank with water from a hose using a garden nozzle with the water coming out full blast to degas the water (see the note below about degassing the water). As the water was be replaced at full pressure the Oscars absolutely loved it and would get right into the main stream of the water. Their reactions were absolutely amazing. By doing this 100% change on a daily basis he is essentially bypassing the biofiltration. However, there are times when he can not change the water daily and the filter still does its job. Feb 6, 2013 - In fact, we recommend a 5-gallon as the bare minimal tank size for even the smallest fish species
Photo provided by FlickrAnyways fish cannot be kept in jars or bowls or anything similar, bettas require filtration and a heater the best size tank would be 5-10 gallons
Photo provided by FlickrMar 25, 2017 - If you want to give your Betta tons of room to swim around and explore, then a 5-gallon Betta fish tank is the perfect size
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The standard 5 Gallon Fish Tank is a favorite amongst freshwater and saltwater aquarium hobbyists. Because of its size, affordability and availability, the five gallon fish tank has created a cult like following in the the realm of nano aquariums.Rule #1 – Stay away from fish bowls and any fish tank under 5 US gallons in size!
It is highly recommended to get at least a 5-gallon fish tank for even just a single Betta fish (also known as Siamese Fighter Fish). In fact, we recommend a 5-gallon as the bare minimal tank size for even the smallest fish species. Anything smaller is not ideal to keep fish healthy due to the fact it will be harder to keep the water perimeters stable.before i made this video i used a gravel vac to clean the gravel. the aqueon 1o watt mini heater is plugged into the 5 gallon aquarium. depending on the size of your fish tank , depends on the size of the heater you need. make sure the heater you are using is the right size heater for the size of the aquarium.

I'm planning on putting three tropical fish in the 5 gallon tank.“The bigger the aquarium, the easier maintaining it will be.” This is probably the single most important rule in the hobby, and for someone setting up their first aquarium, it is an absolutely essential fact of life. The size of the aquarium has a direct impact on several key physical and chemical processes, including pH stability, thermal stability, and the dilution of metabolic wastes such as ammonia. The smaller the tank, the less stable and the more toxic the environment is likely to be.

The size of the aquarium is also important in terms of how fish behave. Schooling fish need to be kept in groups of at least five or six specimens, and that it turn requires a certain amount of aquarium volume and swimming space. When kept in insufficient numbers, barbs, danios and tetras become frustrated and often turn aggressive or nippy. Territorial fish need to be able to claim a certain patch of ground, and if there isn’t enough space in the tank, fighting or bullying can occur. Livebearers pose a particular set of problems because of the way males fight with each other while also tending to bully the females. It is important that there is enough space for the male and female livebearers to spread out, and if necessary find hiding places where they can rest or give birth safely.
For all practical purposes, the minimum “safe” aquarium size is 20 US gallons (75 litres). Such a tank will be big enough to accommodate a reasonable selection of small aquarium fish without being particularly large or expensive. More ambitious aquarists interested in big or territorial species such as cichlids should consider larger systems though, with tanks up to 55 US gallons (210 litres) in size providing a good balance between size and expense.