well seeing as the description is a bit vague, I was just wondering if anyone knew/had any ideas about what possible effect(s) they have on a tank.. are they just cash cows or is there an added bonus? not sure if it was lack of sleep or not, but I had a couple batches of babies seem like they were born very very quickly

The key word in the description is "rich" - that fishie can be sold for considerably more than any other fish. The Golden Guppy doesn't speed up the birth of babies, but there is another magic fish that does.

which one?

lol i forgot magic fih four never mind