Yeah, not ideal, but better than being in a 30g. Korans will get big, so the. 240g will be great. My LFS
has a smallish Anularis Angel for sale, but has been in what is probably a 20g tank for the last 3 months or so. I'd grab it in a heartbeat if I had a large enough tank. It looks very healthy, but sure stinks to see it in such a small tank.
Only other option I can think of us listing it on Craigslist for sale . I've seen people do that when breaking down tanks. Only sell to someone with a big tank.