Ok am going to make my 20g freshwater into a nano reef soon in the future and am wondering what type of corals I should be looking at, also lighting, and water pumps any ideas?

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20 Gallon, 6 zebra dinos, 4 green tigers, 3 dojo loach's, 2 blue gourami's, 2 GBR's, 2 bristle plecto's, 2 longfin rosybarbs, 1 syno cat, 1 leopard puffer
25 Gallon, 2 clown loach's, 1 yoyo loach, 1 veil angle, 1 royal plecto, 1 female krib.
36 Gallon bowfront, 1 Green Severum, 2 Auratus, 1 Venustus, 1 Acei, 1 Kenyi, 1 Duboisi, 1 Demasoni, 2 other africans I haven't identified, 2 Pictus Cat, 1 Rainbow shark, 3 tertas, 1 Firemouth cichlid

What type of lighting you want? Power compacts, T5, metal halide...? The corals you can have will depend on your lighting. For fish you could have clownfish, pretty much any goby, blennies, maybe some types of cardinal fish, ummm... maybe someone else will have more ideas for you. You will probably need some powerheads. Do you want an HOB filter or a sump/refugium, or a canister, etc.

Well I've done a bit of research and have decied on the 4 types or coral that will be populating the tank. They are Colony polyps (Protopalythoa sp.) and some green star polyps, would also like some frogspawn and/or torch coral. As for filtration going to go with the live rock method I've read about. As for powerhead's I was thinking around 2 aquaclear, or the Koralia 750 if any better please tell . As for lighting found some T5's havent ordered yet but the whole fixture is priced at $60-85 at Current USA Nova Extreme T5HO X2 - Saltwater Aquarium Light Fixtures. would a 18" or 24" be better for my set up I am wanting?

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20 Gallon, 6 zebra dinos, 4 green tigers, 3 dojo loach's, 2 blue gourami's, 2 GBR's, 2 bristle plecto's, 2 longfin rosybarbs, 1 syno cat, 1 leopard puffer
25 Gallon, 2 clown loach's, 1 yoyo loach, 1 veil angle, 1 royal plecto, 1 female krib.
36 Gallon bowfront, 1 Green Severum, 2 Auratus, 1 Venustus, 1 Acei, 1 Kenyi, 1 Duboisi, 1 Demasoni, 2 other africans I haven't identified, 2 Pictus Cat, 1 Rainbow shark, 3 tertas, 1 Firemouth cichlid

I don't think that the 18 inch will give enough lighting, but i'm not sure about the other. I don't know too much about T5 and how many wpg you need. Maybe someone else can chime in... Everything else sounds pretty good though.