Well I decided for my 55 gallon that I want a planted freshwater tank. I know I want discus and some tetras. How many discus do you guys think should be in a 55 gallon? I don't want to crowd them, but I also don't want them to be in too little of a school. I was thinking 4 or 6. Then along with that I was thinking 8 to 10 cardinal tetras. 4 black phantom tetras. 2 emerald green cory cats. 1 Otocinclus sucker cat. So... How many discus? And does this sound like a good plan or not?