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yup they hang at the top theyre fast they school quite well they canbe kept in a 10 gallon tank they also can have mor aggressive fish bc theyre fast like a betta.
They need to be kept in a group of at least 6 individuals. More is better. These are great little fish, one of my favorites. Active, but not too wild and fun to watch. Can't go wrong with harlequins.
Every fish store that I have been to in my local area has them. I don't think you will have problem finding them. I had 6 originally, but they didn't school very well, once I got 3 more they are really showing their shoaling behavior.
That they are, very active, but they don't seem to strewed out my betta or my cardinal tetras. If anything, they make my cardinals more active. They come out a lot more now!