Hi - this is my first time on this forum, and am still quite new to fish keeping but I am worried about one of my peppered corys, we have a 'tree trunk' (fake and smaller than a normal one) and the cory just seems to be hiding in there at the moment - only coming out after the light has gone off. The other 2 peppered corys we have seem to be ok but this one just is worrying me. We also have lots of Tetra and I found one dead this morning and I am worried that there is something seriously wrong - can any one help? PLEASE!!!