Forget about it. A single venustus will outgrow a 29 gallon tank in a few months (assuming it was about 2inches at purchase). They reach 10 inches at maturityand need to be ina 5-6ft tank. 29 is really too small for any Malawi species long term. You could possibly do a small group of Ps. saulsoi or a small demasoni colony (12-14 fish), but thats about it.