Hi, I have one gkf who would not come out of his cave (which he shares with a clown loach).So for several days I would thaw out some blood worms and put them near his cave right after the lights go out. Now I just put the worms in one of those cone dispensers as soon as the lights go out and here he comes! They are great fun to watch under the moon lights. I've heard you could have two BUT,it needs to be a realy big tank so they can establish there own territory. Good luck,and yes reasearch is a good thing!