That description certainly is a bit brief! B. denisoni is very popular at the moment, and there are a lot around, so is a definite possibility. These are a large growing species, (125-150mm), which should be kept in group of 4-5 fish or more. A hint might be the price, they are quite expensive, typically £10-£15 each.
Another common fish that looks like a Glowlight but is longer, more slender and very nice is Rasbora pauciperforata, the "Glowlight Rasbora". There are a lot of those around as well at the moment, here at least. Another fish that shouyld be kept in groups, but doesn't grow more then say 70mm.