Apparentely vallisneria is mbuna proof, but I’m not so sure. I like the way you wrote your postAcei are great, and they're one of the most mellow mbuna I've ever kept. As TwoTankAmin said, they're herbivores. I know people who have said they've kept mbuna with java fern, but the few times I tried the fern got ripped up into little green bits that clogged my filter intake. It pissed me off even worse because they never actually ate the fern. Like I said, I've never had anything actually eat java fern. In general, larger cichlids are hard on plants, either shredding them or uprooting them while the fish are rearranging the tank to their liking, and mbuna eat most plants and destroy anything not edible. BTW, I stand by my statement that cichlids have a secret Code of Honor that requires the destruction of plants.