I have a Platy and Guppy (both females) that have developed a hunchback of sorts. The guppy had it first, I thought it was because she was pregnant. But there are no males in the tank anymore, so there's no chance she's pregnant again (I've had her for 6 months or so) Then about a month or so ago my female platy developed the same hunchback. (no male platys so she can't be pregnant either.) Does this happen as they age, or is something wrong with them?