i have a 2.5 gallon tank with 5 glofish in it. I have one of every color and two pink ones Im considering getting a blue one because the last one i had died because he was to small(about half the size of the others) and i also am thinking about getting a penguin glo fish (their white). One pet store told me that five fish in a 2.5 gallon tank is too many he then mentioned the inch of fish per gallon. But they are happy and have plenty of room to swim. Any suggestions on what i should do.