Well, I didn't put a ruler in the tank to get the exact mesurments, Holding a ruler up to the glass and trying to compensate for the distance to the cave so forrt it looked 4 cm, but it's probably 3

He is a broad shouldered hunk though

And looking much better today too! No trace of the red at all.
I think they learn from eachother how shy or outgoing they should be Ed_R... in the tank where I have the web cam I always see at least 2 of them at any given time, and at feeding time they come one by one out in the open to eat.
In the other tank I haven't seen any of them eat, and they are hiding throughout the day. I could see them coming out about half an hour after all lights were out when I had the IR camera in that tank, so I know they do move thanks to that camera.
If they aren't thin, and the food is gone the next morning surely they would get enough to eat though?
