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A betta is best as a solitary fish and it would be better to remove it from your main tank and give it a small tank to itself. You can buy very inexpensive betta tank kits for one betta.
one
No your betta can live in a plastic tank as well. One of my betta fish live in an acrylic tank with silicon sealing the joint pieces.
If you would like to know what gender your betta is, look for the egg spot. (for females) It should be a small white cloud between the head and body. If your betta has one, it's a female. If your betta doesn't have one, it's a male.
umm well just get a net and move him from one tank to the other
The male will kill the female after he spawns her. If she won't spawn he will still kill her. No male Betta will allow another Betta (male or female) to live in its vicinity. So the answer is NO.
You can fit one betta in a 1 gallon tank, but nothing else.
no, one of the fish will get attacked and die
12 to 25
Yes you can put a Betta and bottom feeders together in the same tank. I have two Chinese algae eaters and one male Betta in a 5gl tank and no one bothers each other. The bottom feeders need plants (preferable LIVE) and rocks or something they can hide under and sleep in themselves. I also have a Betta hammock (fake leave with a suction cup to attache to the side of the tank) that you can get at any pet store. My male Betta loves the hammock! One bottom feeder lives in a live plant and the other bottom feeder lives under a rock.
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.
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.