Even with quality filtration, a weekly 50% WC is needed to keep things healthy.
The only Victorians I keep are the Paralabidochromis Sauvagei, (Yellow Rock Krib). These little guys are tough little Haps. Although small, they do well with Mbuna, even predator Haps, as long as plenty of rock shelter is provided. I have 3x males & only 1x female. No problem with that ratio. The females of this species are colorful (yellow) unlike the usual silver of most female Haps.