open water chiclid?

[Fish on Fire]

You can easily keep a large predatory cichlid in that tank with no decor if you wanted to. Something called a tank buster/wet pet. Anything from trimac, red devil/midas, jags, etc would do.

Edit: Whoops, forgot this was in the african cichlid section, lol.

I imagine that you can keep any variant of tilapia in an "open" tank.

 

[Marius]

I think you're referring to the tyrannochromis genus. They are african malawi haps which can get pretty big. Lots of the malawian haps are open water such as the champsochromis caeruleus for an example.
http://cichlidforum.com/profiles/species.php?id=1006
http://cichlidforum.com/profiles/species.php?id=1290
http://cichlidforum.com/profiles/species.php?id=1323

the first is what i was reffering to. would they do well singulary?

That's Champsochromis Caeruleus and it needs a 180 gal minimum. You can definitely try that in a mix of all male Malawi tank, but then you'd probably better go for larger Malawi haps as well.

Kind of like this
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[unstopablepuffers]

my tank has same footprint as a 180, just not as deep.

 

[Marius]

my tank has same footprint as a 180, just not as deep.

I'd go for the all male tank I suggested first, because of the smaller size and less aggression, but if you want to try the predators... 125gal is not enough for the long run as they mature. You need a little more water column for them to be able to "avoid" each other in need, hence why my 180 suggestion.

Let me know what you prefer and I can think of some sources.

 

[unstopablepuffers]

i only want 1. to fill in my african theme. not a tankfull.

 

[andy1985]

You could have Blue dolphins and rosstratus.

 

[Wimmels]

If you want to keep a Tyrannochromis alone in a tank that should be no problem as these are solitary(is this written correct?) animals.

I would keep them in a larger tank. I know that a lot of people keep these larger fish in smaller tanks(and I know Konings advises that as well) but I don't agree with that. These fish get quite large well over 30cm(12")

My personal experience is that the fish(and fellow companions) do a lot better in larger aquariums, and then I am speaking of a minimum of 2,5 meter length(~8'). I have been keeping these kind of fish for quite a few years and had regular spawning as well.