I am going to get 4 otos for my 10 gallon tank (I hope they'll be happy in a group of 4 - or should I get more of them?). I am letting algae grow in that tank so that when the otos are introduced to the tank, they'll have plenty to eat, lol. I have some questions regarding food for otos. What should I feed otos with? How often to feed them? How much food to give 4 of them during each feeding?