I got 2m/2f Guianacara stergiosi from Jeff Rapps at tangledupincichlids.com about 6 months ago at 1" each. From what I understand, the genus only gets to be 5-6" (mine females are 3" and my males are 4"), so a 75 should be fine for 5-6 of them.
I love them. One of the coolest fish I have ever owned. They are pushy without being violent. I have watched them chase each other around (two of them are a mated pair) since I got them and not a single scale or fin has been torn, but they definitely let their tankmates know when they don't want them near.
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