Hey guys. I plan on upgrading my 55 gallon planted tank to a 90 when time allows and I was going to house some discus in it. Right now my lfs has some locally raised discus that a gorgeous and have a decent price tag. I know they are schooling fish and Ive heard about up to 7 being kept in a 55 gallon tank. I was planning on starting with 3. The only problem is I have a female angelfish who has been around the majority of the tanks life. She is around 3 1/2 to 4 inches long. Will there be any issues with adding 3 very small discus? My water quality is pristine and I do water changes every few days with ro water. Thanks in advance!