hi Scooby_too
Discus do prefer to be in groups, they are not as shy that way. Especially juveniles. But sometimes due to aggression the only safe thing to do is separate them. That is why you see one Discus in the 55g and one Discus in the 29g. Also the reason there is one Angelfish in each tank as well lol..
It was either that or find another dead Discus... My pigeon blood stressed out another Discus so bad that it never recovered.

btw, Discus get along with other fish, such as cardinal tetras, German Blue ram, and even rainbows. I have a blue Gourami in the tank now and neither are bothering each other. Discus can be pretty mean to their own species when they are trying to establish the pecking order, but ignore other fish for the most part.
That is why its a good idea, that when you are ready to buy them,to get the ones you want and introduce them together at the same time. But they are cichlids.. and boy do they get picky each other!

~ kate