That means they need a tank six feet long, or preferably longer. These are fish that constantly swim throughout the day in the wild, and those needs cannot be met in a tank under that size. Now, if you got rid of those two, (and if it were me, the damsels would go to, they grow up to be real
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if they aren't now already), then you could have maybe around 2-3 small, fish. You need to do some more reseach, as it's apparant that you haven't based on your last fish choices.