Compatible collections of fish?

Question
Hello, I need to find out about setting up two compatible collectons of fish and I am having trouble finding the information that I need, so I would be very grateful if you would be able to help me.
Tank 1: Five  species of tropical fish who will live happily together without causing harm or stress to each other, which are able to feed without competition and come from a similar region (Amazon).
Tank 2: Five species of marine fish who will live happily together without causing harm or stress to each other, which are able to feed without competition and come from a similar region (Barrier reef).

The fish in each tank should be a combination of surface, middle and bottom feeders to minimise competition at feeding times.

Answer
Hi, i can deffinatelly help you with the first tank first off, you want about 2 maby 3 bottom fish, including plecostomus fish.(sucker fish), catfish,coreodaras catfish,glass catfish or algee eaters, now you are ready for the middle and top dwellers, some zebra danios leopard danios,giant danios, rainbow fish, irridesant sharks,red taild sharks,angel fish,all types of tetras, female bettas,black mollies,balloon mollies,marbled mollies,swortails,platys,guppies,loaches,bala sharks,one male betta may be included and even goldfish.All the fish which i have named you are all compatable with each other.And for the marien part i am not too sure.THANKS!