I have one right now and it's quickly becoming a favorite of mine. They are really cool fish! If you just got it, it may take some time for it to settle in. So don't be overly concerned if hasn't eaten anything or if it hasn't been out very much yet. Mine took about 4 or 5 days before it started to come out more and more and finally ate it's first meal. As already mentioned they do get quite large so you'll want to make sure he has enough room to grow into. Mine's in a 75 gallon right now and he seems to be doing ok so far. He's probably a little over 12".
What do you currently have as tankmates? Mine is housed with some Gouramis. Loaches, and Barbs who all go into a feeding frenzy as soon as food hits the water. To be safe I feed mine by hand (when I'm feeding frozen foods) to make sure it gets some. My other fish are just so fast that I'm afraid that they wouldn't leave anything for the Rope to eat. It took a while for my Ropefish to feel comfortable enought to take food from my hand, but now he's more than willing as long as I don't make any sudden movements that'll scare it. Mine especially loves frozen beefheart and mysis shrimp. I've tried frozen bloodworms and brine shrimp, but so far he's not very interested in that.
They're nocturnal so you'll want to make sure there are some dark hiding spots for it to hide in when the tank lights are on. Mine has claimed two of the 4" terra cotta pots that have a about a 1.5 -2" opening. He's almost always seen curled up in one of these pots when I check up on him.
As it was already mentioned they are great escape artists so you definitely do want to make sure that all openings are sealed up. If there is an opening it's most likely find it and will try to get out. If this does happen, don't panic if you find it hours later all dried up. They have a special respiratory organ which will allow it to survive up to 6-8 hours out of water. So if it this does happen to you, it may 'revive' itself when you put it back in water.
That's pretty much all I can think of right now.