Thanks, that might explain it, My Ph has lowered from about 7.5 to about 6.8 since I added plants so that might be the problem. the first one might have died from a difference between the shop and my tank.

Hi,

I've had 2 pygmy cory die of the same thing. They appear to have what looks like massive internal bleeding on their right hand side (see picture), then in less than 24 hours they unfortunatly die.

http://img200.exs.cx/img200/9260/cory8he.jpg

It first occured when I had finished cycling my ...