I currently have a 5 gallon tank with 1 mickey mouse platy in it. My question is can I add 1 more? I ask because I have been given conflicting answers. When I initially bought the tank the pet store told me I could fit 2 in my 5 gallon. And I've read in places that I can fit 2 and other places I've read 5 gallon is too small for even 1. But my 1 fish currently seems very happy and my tank is cycled and very healthy. So I'm wondering if I can put another fish in so my current one isn't all alone or if I should just upgrade to a 10 gallon? And if I do upgrade to a 10 gallon, how many platies can I safely fit in that? Ideally I would have 2 in my 5 gallon, but I know this may not be safe and I don't want to risk anything. Thanks