Thanks, having those fish species names helped a lot!
However I've been looking into both kribensis and convict cichlids, and was thinking of maybe having a breeding pair of one or the other, and selling/giving away the fry? - From what I've read, the kribs would be fine in my water parameters, but if I decided to go with the convicts I'd have to use something to make my water a bit more harder (which I've been doing some research on).
I also have at least 4 LFS in my area (that I'm aware of), so I probably won't have any trouble getting rid of the multitudes of fry.
I really like the look of both of these fish (especially the convicts), but I've been reading that they might be a bit shy without some dither fish (which would probably end up being some kind of tetra... I haven't really thought about it (let alone looked into it yet) though).
My only concerns are, that considering that both of these fish are pretty aggressive during spawning (which is pretty much always, as they breed like rabbits!), would it be best to get the kribs, as their minimum tank size for a pair is 76L/20g, which means that they'll have plenty of space to have their own territory, as well as give the other dither fish somewhere else to go without being too stressed out?
Overall I'd prefer to have the convicts, but if they'd shy away all of the time because there aren't any dither fish, then I don't think I'd enjoy having them too much.
I'd really love to have the rainbows but I've read that they also breed like rabbits with a large spawning of fry, and I don't think I could manage getting rid of 4 pair's (so 6 fish) worth!
... And then of course I think back to my original fish choices, and I realize that with the new information I've found about how to change your water hardness, I could probably end up getting some of my original fish choices!
So many wonderful aquarium/fish possibilities
, so little tank space to fit them into, lol!