hey guys a lot of you are going to hate me for this and I hate myself for this but right now i have 2 6-inch rbp's in a 30 gal. But it didn't start off like this at first I got them and they were about an inch in size and now they definitely need a 55 at-least, but my dad wont let me upgrade! is there anything I can say to him that will convince him to let me get a bigger tank?