Aro and Discus is NOT a good combination. You have a way better chance of success with a two aro com. than an aro-discus com (along with what ever tankmates you want with it). Doesn't matter what other tank mates you put with an aro-discus, asian aro and discus is just an almost impossible combination. But then again you might be the very, very lucky one to have success in it. If you're tanlking about silver aros and discus, I'll give it a higher percentage of success. For asian aros.doesn't matter if you start it with a 4" aro and big discus, once the aro hits 12" or so he'll start stressing the discus.