how many discus?
still, I find it hard to agree with mixing the two....goes against everything I've ever read and/or experienced.
angels are aggressive. discus aren't. makes for a bad mix.
this isn't even taking into account the whole disease thing.
it is done quite successfully by many. I for one have had no big issues keeping Discus with angels.
the discus are not Mamby pamby crybaby bedwetters.
they can be every bit as aggressive as angels.
I have kept the tow together for many years.
but as mentioned. you should QT the angels and treat with anti parasite meds. metronidazole, prazi and levamisole hcl is the mix I use to treat the angels for parasites.
also it is a good idea to let the discus get established prior to adding the angels.
I have kept young angels with young discus..but would recommend growing the discus out . both species benefit when grown out in a bare bottom tank with several feedings per day. with daily water changes.
if you want to try mixing the species. have a 75-90 gallon tank minimum for adults. be mindful of pairing angels and discs paired are aggresive.
just be educated when attempting this.