I've had one for 20 years or so, in a 20g tank. No problems, but it might have eaten some of the rosy reds I added for visual interest. Mine shared the same hiding space as a bumblebee catfish, is active day and night, and eats shrimp pellets with no problems. (I have offered other foods, but surprisingly the pellets seem to be preferred.)
Recently relocated my fish into a 46g, and the reedfish seems quite content. Current tank mates are a large tinfoil barb, clown pleco, dragonfish/violet goby, small bichir, 2 small bumblebee cats, 4 Denison barbs, and 2 horsefaced loaches. Eventually everyone will be moving to a larger tank, but I have never had problems with "Wormie", as my sister calls him.