I have a 10 gallon tank with 5 mollies and people have said it's too crowded. What is a good way to fix that? I love my fish and the tank is brand new and expensive! My mom hated how much money I spent! The fish seem fine with it, but if they have fry, will it be too much?! Also if anyone has a 29 gallon used tank I'd gladly take it for a good price. Thanks!