ok ive had 3 oscars and 1 parrot cichlid in a 75 gallon tank for about a month and a half. they were all smallish. 1 oscar is 2.5" the other 2 and the parrot are 1.5". i also had 2 pleco in there about 3". anyway i recently moved the tank and my roomate was playing with the dog and threw a ball...