Add new discus to my group

[Spagh1i]

is it okay to add 3 discus which is a bit bigger than my existing?
the group i have right new is a goup with 5 juviniles, maybe 5-7 cm crossover.
the tank is about 550-600 litres

[Merrilyn]

That shouldn't cause any problems. It's actually better to add a group than to add just one fish.

Before you add the other fish, do a water change and cleaning of the tank, and re-arrange things in the tank a bit, so old territories are no longer clearly defined. Then they all start like fish in a "new" tank. Helps to stop aggression.

[Spagh1i]

thanks for the quick answer =)