No offence but a 1 gallon unfiltered and I am assuming unheated? "bowl" is atrocious. That fish needs at the very least, 5 gallons with a gentle filter such as a sponge filter, and a small heater.
In the wild they do not live in puddles as many would have you think. They die and suffer in them in the dry season. They breed and are at their best when the irrgation trenches and marsh streams are in full flow. This is when the local people collect the males, when they are at their best. If you look up pictures of the fields and small streams you will notice that they contain far more than 1 gallon, since human beings have to stand almost knee deep in them, and they are very long .
If you get a larger tank you will have to do less water changes,( 1-2 a week ) since the filter will ( after is has cycled) contain the nessecary bacteria to perform biological filtration. You will be very unlikley to get scum on top of the water, and have a lower chance of your fish getting stunted or diseased. By getting a bigger tank you'll benefit your fish IMMENSELY, and also create less work for yourself in the long run.