Today I added a new discus to my 'discus tank' and straight away the little blue one came out from hiding.
. All the discus were in a line (above each other). Some would twitch at one another. This was the yellow one and the new one. Then big blue jumped in and started pecking the little blue and the new one. The yellow one is constantly trying to get the new guys attention lol.
Image of the new guy below.