yes there are many bugs the bird can get from you and vice versa
something that can make you feel crook for a few days can be fatal to birds with their higher metabolism
hope you get better soon
quite a few aros on trademe at the moment
that tank will be good gotmilk, but if 2 aros don't like each other it won't be big enough
bringing 3 or 4 up together may work
Have seen this before with birds, everyyone breeds the new colours and wild becomes cheap as chips
so all stop breeding them until not much wild type left
and the bashing themselves on the lids or sides
getting young fish that will grow with the aro will be o.k
there are many arowana keepers experiences on monsterfishkeepers forums to give you an idea of what may work