i have a male betta that just sits on his back end in the water what is that?

Answers:
Swimbladder is a disease which symptoms cause fish to become unable to swim correctly, your fish may exibit swimming toward the bottom of your tank or bowl, then floating back up, swimming in circles or laying or floating on his side..
There are three main things according to the posts and articles I've read that can lead to swimbladder disease.
Constipation due to overfeeding
Bad water quality
Bacteria
I recommend the following regimine, recommened to me over two years ago.

First, as soon as you notice signs of swimbladder do a large water change, taking care not to stress the fish by having the water temp as close to his bowl as possible.
After your water change you should not feed your fish any food for two days. On the third day feed your fish a fresh pea. Frozen peas thawed, popped out of the skin, and cut into bite size pieces. And then do another water change so that any uneaten peas do not contaminate your water.
If you don't use aquarium salt this is a good addition to most tanks. The recommended dose is one teaspoon per gallon, or one tablespoon per five gallons. If you have never added salt and you are unsure; you may want to first acclimate him at only 1/2 tsp per gallon.
A

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give more details then i can help. =]

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It maybe be swim bladder.

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All betta fish have their own personality.
As long as he is eating, swimming, pooping I don't think you have anything to worry about.

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I had a collection of about 15 male bettas at one time. They all did different things. I had one that sat on its fins, and another that slept on its side.

They all did something unique. This fish is loaded with personality. As long as he is doing everything else, (like eating)there is nothing to worry about.

Take Care

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My betta does that too. I think its just normal.