I have heard that it is 1 fish to 1 gal. If that fish doesn't reach over 2 inches full grown. I have a breeding tank that I have mollies, guppies, plateys, swordtails, neons, & a siamese algea eater. Just know that if you do get neons then they do best in groups of 7 cuz they like to school. Just know that im one of those people who think that every tank should have an algea eater of some sort in it cuz the help with the bioload. But if you do get one then wait like 2 weeks after you get the other fish so algea has time to grow so the algea eater has sumthing to eat or you can buy algea tablets & go that route. Just make sure that you know the full grown size of any fish you get. & make sure all of them are compatable.
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