there are other c/l in the tank and a few silver dollars, 5 x dats, an irwini and a bush fish. all these seem fine. my water is ok, just my ph is 6 - its usually around 7.
Ive had a long hard think about my schedule with water changes n feedings etc, and the ONLY thing thats changed is the fact that i used a solid silver butter knife to help sink a large chunk of veg for the clowns, instead of my usual one.
I think the metal has poisoned the water in some way and caused my problem, it may sound crazy but nothing else has changed routine wise for weeks..