safe? Can i have: 1 Angelfish(2 inch), 2 Silver Dollars(1 inch each), 2 guppies, 5 platies(small), 1 yellow molly, 2 Sword-tails, 1 Betta, 1 very small leopard pleco, 1 cory catfish(small), and five neon tetras in a 30 gallon tank??? My fish look really happy!!! and how much food do i need to feed them daily?