Cant wait to see pictures of the 55g with the darters! Good luck though- keep it smaller maybe a pirate perch would be fun but they will hide all of the time
I guess that would depend upon where you live and what temps you will be maintaining. I'm not really a cichlid guy; maybe there are species that will live year-round at cool temps (as opposed to just cooling down during winter) and which also don't grow up to be aggressive jerks, but I don't know of any. Darters are small, non-aggressive, fairly fragile fish; not really what one thinks of as cichlid-tank material.
Centerpiece fish? This is an aquarium, not a floral arrangement; I don't think in terms of centerpieces, but I do think that darters themselves are pretty impressive aquarium fish in their own way. If you can snag perhaps a few Rainbow Darters or similar colourful species, how much more of a centerpiece does your tank need?
Edited to add:duanes beat me to it; gotta type faster. Yeah, baitshops can be great sources for oddball natives from time to time; so can minnow traps and seines if you like that sort of thing. Or, if you are in the U.S. , why not check out places like Jonah's that sell natives? Some of the dwarf sunfish like Black-banded might work for you. They are, like darters, kind of picky about feeding and sometimes simply won't switch to frozen, but usually it can be done; Black-banded Sunnies are probably the easiest to train onto frozen of the dwarves.
Take them fishing
Fathead minnows rarely get over an inch but that's still a lot of fish!
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Should I just let some of the minnows go into the creek?
Fathead minnows will easily reach 3" and given a year will often reach 4".
...and no, never release a non-native species into a waterway; it's a recipe for ecological disaster and restrictions on the hobby.
Well thankfully fatheads are native to where I am so I should be fine. I had no idea they get that big! When I googled it, the answer was 1 inch