I've had anubias nana in my tank for a few years now, both with roots in sand (don't plant the rhizome) and on driftwood. It's dealt with weeks long blackouts due to broken lights, no ferts, the works. It just keeps chugging along, I trim them occasionally and split them when they get big enough, best money I've ever spent on plants, they've lived through more than Java fern ever did.