I have had poor luck with my Platties. I'm fairly certain that it is because they have too much protein in a diet meant for a Betta, which I also have in the 10 gallon tank. Its all I can think of, because the temperature, water parameters, and everything else is perfect and they aren't showing signs of any common diseases. For the past 3 days, I've been scooping my Betta up for feeding time in the little cup I got him in, feeding him, and putting him back within 5 minutes. He has already gotten to where he swims into the cup as soon as he sees it, for his food. Meanwhile, I feed the Platties some tropical flakes, and put him in when everyone is done eating. Is this okay, or will it be harmful to my Betta fish to continue this? He's never out of the water, or captured by a net.