How many schools do people recommend for a 150 gallon? I'm definitely starting with a small school of roseline sharks in this tank, but I definitely want at least one other school in here. Here's the schooling species I am considering so far, though I am definitely open to new suggestions! Glass catfish OR Indian Glassfish (I want a clear species for sure!) Swordtails Penguin Tetras White Skirt Tetras Otos Corydoras Aeneus mix of albino and bronze I am pretty confident that cories won't make the schools look like a mess but I'm not terribly clear on where the other types of fish swim in the tank and how tightly they school. What would you guys do?