hi, I was thinking I'd like to get some Green puffers. I was wondering if they will eat smaller fish. I have a 10 gallon set at 77. How much salt do I need to put in? How many Can I have , adn are they compatable with mollies and pleco. Can plecos live in a tank with salt. Can they eat flakes? Do they need live food? Sooo many questions! Thanks in advance for your advice!