So I have my 55 tall (36"long 24"tall 15"deep) as of now with 2 angels and 11 Kuhlis. Could I get 2 discus (potentially 2 more in a couple months) to add to this tank. I've always loved discus but never had the money and now that I have a job I can afford some! I understand that it may be too small but I'm so confused. Some places said 20g for 1 and then another 10g for any more. That's why I would get 2. And also would the discus school with my angels?