why not start with just one and see how it goes from there? It's much easier to take care of 1 baby aro then multiple of them especially when they are really fragile at such a young age and small size. For temperature I would leave it at 82 degrees.
got rid of my fish today and im going to get a baby silver aro tomorrow. how many times should he be fed a day? what other fish will silver aros get along with?