Recently I went to the LFS by my house to purchase some Glofish. My original plan was to buy 1 red, 1 green, and 1 yellow and put them in my 5 gallon tank. However the lady at the store told me I couldn't do that. She told me to make sure they were all the same color so that they would form a school. I was wondering if that was really true? ??? I really don't want to have to go back and buy 3 greens, wait, buy 3 yellows, wait some more, and then move all of them into a bigger tank and hope they eventually school together.