Ropefish are very interesting fish. I have 4 rope eels and a peacock eel. I also recently purchased a 3 inch oscar. Last night I saw my oscar eating his floating cichlid pellets beneath the moon light at the surface and one of my small rope comes swimming by to eat to. The oscar looked like he tried to bite him numerous times, but he could've been going after the food. Not sure yet. I will have to investigate further.
But the ropes are a very cool fish to keep. My four live happily together in a small castle. They intertwine with eachother all of the time. If one comes out, they all do. Whenever I do water changes, they are out enjoying the freshwater all day and night. At least one of them is out and about all day. But they all come out at night. Mine eat rosey reds and vegie wafers and basically anything left over. I rescued all of mine from walmart. They each had white ammonia patches on their skin and they have healed 100% within a month. Get these fish!!! You won't be sorry!! Wait until you see one eat a minnow, it is so cool. It takes about 20 min to swallow if big enough, so they swim around with half a minnow sticking out of their mouth. And you can see the huge lumps in their bellies!!!