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Assuming your tank is filled to within 1" of the top and that you have sufficient substrata (gravel) at the bottom in which to grow plants, say it's 2" deep, then your tank is missing about 3" of its water holding capacity If your tank is 12" deep you have lost close to one third of its water ie almost 1 gallon. That means your actual quantity of water is just over 2 gallons. The basic rule for fish keeping is 1" of fish needs 1 gallon of water. A Male Betta grows to about 2" in body length. This means that your tank is holding its maximum fish capacity already with 1 male Betta in it. The answer to your question therefore is. You can 'safely' put no more fish into your 3 gallon tank with your Betta.

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Q: How many fish can you put in a 3 gallon tank with a betta?
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Related questions

What fish can you put in a five gallon tank?

you can put a betta in a 5 gallon tank


How many fish should be in a 3 gallon tank?

Only 1. Usually a Betta is all that is kept in a 3 gallon tank


What is Should you get with a 1 gallon tank A Betta fish or a variety of fish?

A betta fish would be much more suited to a 1 gallon tank than a 'variety'. You shouldn't keep much more than one fish per gallon anyway.


1 gallon tank what type of fish can you put in it?

A 1 gallon tank could have one betta fish, but you will need to be diligent about changing the water on a regular basis. The smallest tank that should be used, even for a betta, is a 2.5 gallon tank as it at least gives the fish swimming room.


Which fish can go with a baby Betta fish who is probably male in a ten gallon tank?

None are recommended if the Betta is a male.


What games can i play with my new betta fish in his 1 gallon tank?

Go fish


What fish will live with a male betta in a 10 gallon tank?

Any.


Can a betta fish be put in a 5 gallon tank with 4 guppies?

No


Can you put a female Betta fish in a 1 gallon tank?

Yes.


Can you put a betta fish in a three gallon tank?

yes of course! my betta is in a 2.5g and is perfectly fine


Is this a good community tank 3 female betta's 6 neon teta's and a otocinclus catfish for a 10 gallon tank?

The fish are not bad together. But way to many fish for a ten gallon tank. You put one fish for every gallon. They will probly do fine but you will have to clean more.


How many fish fill a tank of 1.5 gallon?

Just one male betta, but you should consider a proper betta set up which can have 2 to 2.5 gallons for the one fish.