I have 4 pygos a red, a caribe, and 2 terns in a 75, they are about 5 inches, there is a lot fighting lately and i just saw a fish with a nip so i need to seperate them, here is the ? i have 2 55 gallon tanks I can put them in but i need to know how long can a 5 incher live in a divided 55 gallon and with water changes etc will they grow up to 8 or 9 inches in such a space? the dimensions of the tank are 48inch by 12 by 18 divide in the middle. so about 24 incheslong by 12wide by 18high each...