I agree about raising the temp slowly. Maybe 2° every other day.
As far as discus, are these adult or juveniles? If they are a breeding pair, then it should be fine. Otherwise, I would look into getting a small group. Discus are shy/nervous fish and do better in groups. It's just safety in numbers for them.
The fish should be fine, but the adult RCS might be fine as well. They may eat the young, but discus aren't really aggressive hunters. The discus may make an attempt, but once they realize the shrimp are too fast, then they will quickly give up.
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125 gal (473 liter): Low Tech (1.5wpg PC for 10 hours, no CO2/ferts, gravel substrate), Equipment (72" Coralife PC, Eheim Pro II 2128 w/built in heater, FilStar XP3 w/Hydor ETH201 inline heater), Fish (6*Discus, 2*Angel, 5*Clown loaches, 4*L-018 Gold Nugget pleco, 1*L-260 Queen Arabesque pleco, 7*Cories, Farlowella cat)
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