anglers are among the worst tankmates for lions. if the lion is bigger, it will eat the angler. If the angler is bigger it will eat the lion. if they are the same size (which will only happen if you get a Commerson's angler) there is a good chance something bad will still happen. it is not uncommon for an angler to die trying to swallow a tankmate that is too big - in that case, both fish die. I had an angler swallow a fish twice its length once. a great reference is the angler/frogfish chapter in Reef Fishes volume 1 (by Scott Michael) for appropriate tankmates for anglers. there are very few. anglers do best in species tanks.
I think a smaller eel or *maybe* a tuskfish would be good choices.
A good reference for species information is wetwebmedia.com
And you know about Frank Marini's Lionfish care sheet from Reefkeeping stickied at the top of this forum, right?
WWM links to angler, eel, lionfish, tuskfish articles. they do a nice job of discussing compatibility and adult size, but don't always make recommendations on appropriate tank size.
Morays -
http://www.wetwebmedia.com/morays.htm
Lionfish -
http://www.wetwebmedia.com/lions&rels.htm
Lionfish -
http://www.wetwebmedia.com/ca/cav1i2...lionfishes.htm
quote from second lionfish article:
Quote:
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the popular Pterois volitans lionfishes will require very long aquariums (>6 feet/2 meters) for growth, with less risk of stunting or dying prematurely as with smaller tanks (under 75 gallons).
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Tuskfish:
http://www.wetwebmedia.com/marine/fi...on/faciata.htm
Anglers:
http://www.wetwebmedia.com/anglerfishes.htm
the best source of information for anglers is Reef Fishes volume 1.