as Mark said really but looking at your stocking it doesnt look ideal...
Angelfish x 2 - angels can carry certain diseasea that can be passed onto discus so its advised not to mix the 2 species
Cherry Barbs x 10 - dont think these would like the higher temps.... not sure
Penguin Tetras x 13 - known to be fin nippers and very active so not a great choice for discus set ups
Dwarf Gourami x 1 - can become bullys and annoy other fish when a bit older
discus prefer warmer temps at about 30oC so you really have to take that into consideration when thinking of them for your tank. most fish will live quite happily at 26-27 degrees but that extra few degrees can be stressfull for certain species and even make them lethargic. also if the discus are small they will need plenty of feedings per day and would be better off in a bare bottom tank so the uneaten food can be removed before it spoils the water causing issues. with 3 or 4 feeding per day for smaller discus its likely that you will end up over feeding the other tank mates as these will eat most of the food provided as discus are very slow casual eaters compared to most other fish and will certainly be out competed for food with the stocking list you have provided.
if you really want discus then a pair would be ideal in a tank of that size but they would have to be a pair that have lived as a pair so no bullying etc occurs, maybe get an old breeding pair that a breeder is selling as these fish will live in peace together. the stocking in my opinion would have to be changed though to suit the discus, you really need to plan the tank around them instead of adding them to an existing set up.