My male HRP and female Rio Cabuya siquia have a thing for each other. When I place them w/ multiple of their own species, they do nothing. As soon as I place them back in the same tank, they get busy. If it is that devoted, who am I to keep them separated. I don't protect the fry, but one lived in a crowed tank. He is not that old and is already a full 6" and not slowing down - much bigger than either of his parents. I just placed him in a 300 w/ his dad and his dad is the only fish he picks on - ungrateful SOB