Great fish. Calvus are one of my personal Favorites Second only to my Frontosas. Mine are also on brine shrimp at the moment. Point of advise on feeding brine shrimp, monitor how much gets sucked up into your filter, especially if your feeding live brine. In either case, it may behoove you to turn off the filter for a few minutes during feeding. If too much gets sucked up into the filter, it's a real waste. Plus dead brine shrimp can really muck up a filter. Best of luck with them.