Well, you definitely should have time to experiment with this one. Some of the veterans to the site may remember me trying to get my one that wouldn't eat for me to eat. I tried for about 6wks. I even tried to force feed him (yep I held him and put the food down his mouth). He had a dislocated jaw. A semi-common problem with lions. Eventually I tried to take him to another friends tank as a last resort to see if a new tank would help spark his interest in food and that wa when he was eaten by a tesselata eel. He was about 8-9" and never starved to death after 6wks, for that matter he never even appeared smaller looking. Don't stress, take your time, and wish for the best. I would put a couple dozen feeder guppies in there just so the tuskfish can't eat them all and see if the lion goes for any of them. Check his jaw too, just in case his lower jaw is dangling a little and it appears he never opens it no more (dislocation) not that it is this, but if it is then they tend not to yawn anymore either. Good Luck. Keep us posted. I will try to visit the site more and tell you all the things I tried. Later.