Thanks Tony - if you look at my thread in the General Discussion Forum you will see that my tank went through a recent challenge (CO2 disaster). I added a second multi for company after I commented on this thread a couple of weeks ago, and a cave made from a split terra cotta pot. Anyway, after the yeast infiltration a couple of days ago, one of my multi's didn't make it. So now I have just the newer one, and he seems to be rallying after I thought he was a goner earlier today.
I'm responding to your thread not only to, well, respond to your thread, but you introduced a new concept to me about the behaviour of this multi: even when he had his partner, he was always wedging himself at the corner of the tank between the heater and the glass. He seems to love that spot. I really don't want to cause any more trauma to my fish right now, but at a later point do you think I should move the heater away from the corner so the multi will move around more??? I'd love to see him more often, and he has explored the new cave that offers prime viewing for me while protecting him, but I don't want to cause any undue stress by removing a favoured sweet spot.