Great video Honorer. They look more coloured from the previous video and seems to like their new surroundings and water . They look promising batch of discus , and you have made the right decision giving them their own tank and taking care of their needs separately from the monsters that you have in the other tank (pool)
I have yet to see a LFS that takes back sick discus in his own tanks . Although he made you a big favour , I think his move was highly unprofessional , especially if he plop them back for sale in the tank with his other discus .