I got 2 glofish starfish today and on the recomendation of pet store (I know) I got a 5 gallon kit tank. So its day 1 and I found this site and realised the error of my ways. Now how do I fix this? I would like to return the tank but the fish are in it and I'm not sure how to go about the switch safely. I would also like to get more glofish for a proper school. I'm thinking 6 for a 20 gallon tank?