help picking large tank inhabitants

Pink tailed chalceus look sick..... I am currently leaning towards the idea of having two schools of fish, something on the bottom(like pictus cats or something active) and something for mid-top. I love silverdollars, but if I could find something equally attractive that won't devour my(limited) plants that would be awesome.
sick as in "that's sick dawg" or sick as in i'm going to vomit on my pink fuzzy slippers sick?
 
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i think there is a yellow tailed version as well (just fyi)
 
check out chalceus erythrurus
that i think is the yellow finned version
 
AFter looking up some Geo's, I do like the surinamensis and Brasiliensis. I think I would skip the cories because they aren't quite big enough.. I am thinking the smallest fish size(at least once they are semi-adults) for the tank would be around 5-6"

I am currently taking a look at four line Pictus cats... Not sure if they will work but they look interesting. I'll have to do some research
You could try corydoras barbatus, they get to almost 5 inches.
 
How about the estuary? Brackish water, do some scats, monos, maybe archer fish. Order some mangroves and plant them in the the substrate. It would be interesting.
 
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