The big question of course is he coming out to EAT? When they start showing no interest in food there is really something wrong but if he is just in there and will come out for food and to do some swimming then it could be one of a few things.
1. He has noticed that some of the other tank mates like it there and he is showing his territorial dominance there by refusing to leave. Stinker!
2. He just really likes it there or is feeling a little insecure for some reason and a nice book read to him or some quality time with him may help. Just remember that your schedule has changed recently and he may be feeling abandoned as he doen no see as much of you. If this is the reason he WiLL get over it on his own with a little more quality time with you, his Mummy. He is just being a baby and needs to know that you still love him.
3. the temperature in his tank may be a little cool and he is not feeling as active.
They are all easily fixed but unless he has stopped eating and swimming when he sees you all together, I do not think he is ill or needing any special attention other than a little fun type stuff. He is missing the time you spend with him.
Keep us informed as he is so special we want to know.
