Topic: Im new to fish aquariums and need some help figuring out how many fish I can stick inside one tank or aquarium. I am either thinking of keeping betta fish or else goldfish. It really is a toss up for a choice right now. Is there a calculator or a guide on knowing how many fish can fit in a tank? I need help here. I would like to keep as many fish in one tank as possible. Please help me!

*Awarded Answer
Posted by Charlie J: I Found these Articles to Help

There isn’t always 1 right answer when it comes to determining how many fish are appropriate for your aquarium. However there is a rule-of-thumb way of getting an estimate.

For each inch of fish you will need 2 gallons of water.

Example: You have 3 goldfish, all measuring out to 2 inches each. So 6 inches of fish will require approximately 12 gallons.

Tropical Non-aggressive:

Each inch of fish requires only 1 gallon of water.

Example: You have 3 male guppies at about 1 inch each for a total of 3 inches. You’ll need 3 gallons of water.

Semi-aggressive Tropical:

Aggressive fish can be a little tricky since not all fish will get along, they may require more space, so ask your local fish store for specific setups.

However, they tend to follow the same rules as the non-aggressive tropical fish, and require about 1 gallon per inch of fish.

Choosing Aquariums for Beginners

Unfortunately new aquarium hobbyists are bound to make mistakes when setting up and caring for their first aquarium. Hopefully this article will help reduce the number of mistakes. ;)

Location, Location, Location:

Before you start setting up your aquarium its important to keep in mind that some places in the house are better than other for keeping fish. When choosing a spot you don’t want to expose the fish to too much light nor too much darkness. Don’t place your tank in direct sunlight such as in front of a window, instead put the tank in room thats well lit by the sun, away from the direct sunlight.

Shape and Size:

If this is your first aquarium your best bet will be to start with a rectangular tank as opposed to a round, hexagonal, or octagonal tank, because they are by far the easiest to clean and also give you the best view of your fish. Deep tanks are harder to clean as well, and if you’re uneasy about submerging your arm in the water, than the more shallow the tank the  better.

When it comes to size you’ll have to figure out how many fish you plan on having. To determine what size aquarium is right for you see my article about how many fish can be put in an aquarium.

Freshwater Setups are Best for Beginners

So you want to get your first fish, but can’t decide what fish you want? Well since this is your first aquarium the choice is easy. The best kind ofTropical Freshwater Aquarium fish for you are freshwater fish. Simply because they are by far the easiest fish to take care of.

Yeah, yeah, I know. The saltwater/marine fish you saw the other day were a lot more vibrant than those boring freshwater fish. I’d love to take care of saltwater fish too, but they are leaps and bounds more difficult to take care of. Heck I’ve had freshwater fish for 5+ years and have even worked in the fish section at a pet store and I still don’t feel confident that I can care for them properly.

There are 2 major groups of freshwater fish. Goldfish and Tropical.
Both types of fish tend to be very non-aggressive and for the most part can go with any other fish that fall into their category of goldfish or tropical, but saltwater fish are often times very aggressive and need much larger tanks.

While both fresh and saltwater fish can be very healthy and resilient if taken care of properly, you’re going to have to worry about a lot less disease and chemical imbalances when working with freshwater fish.

Ah I almost forgot to mention that saltwater fish are EXTREMELY expensive compared to most freshwater fish. God forbid you lose a fish or two, you’ll still be content that you only paid $1.99 for your guppy

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