Loaches Online Forum

I have 3 b. kubotai that have been living together for almost 2 years now. A couple of days ago I could not find one of them anywhere in my 260 l tank. When I finally managed to find it was hiding under a large root which it didn't want to leave. This was several days ago. At first I though that it was the same fish that was spending all it's time under the root but I was wrong. Today it is another one that is there and the first one is staying near by.

They never behave like this before. Does anyone knows what they are doing?