Well, to be honest with you I don't recommend keeping discus in anything smaller than a 55g tank. That is the ideal tank to grow out 6-10 juvies until they are 5" each or so. You need to keep them in groups of 5 or more for them to feel comfortable, unless you have a mated pair but those are more expensive and I'm assuming you don't want to start with those.
Don't get me wrong, you can keep the juvies there for some time but they will eventually require more space and a larger tank. For a group of 6 I stongly recommend a 75g tank as the minimum.
You can keep plecos with discus. Generally BN plecos are kept with them since they stay small at around 5" max and that's a large BN pleco. You could keep two of those in your tank. They seem to tolerate the higher temps that discus require. I've had my BN plecos in 94 degree water before with no issues seen in 10 days at that temp.
You should go with a bare bottom tank according to most experts when growing out discus. That's the way that all do it and that's the way I do it as well. You can still keep live plants. What I do is put them in clay flower pots with Eco Complete or something similar.
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