I have a 30 gal FW tank. It has artifical plants, and is stocked with 2 fancy guppies, 2 cory cats, and a black mollie. The mollie was added on Monday. Yesterday, I got a suprise! There are now 3 tiny black mollies swimming around! What do I need to do in order to keep them alive? I don't know a thing about fish-babies! Any advice would be great! Thanks