Yes, it is. This was a lovely black marble plakat that I intended for breeding. I really feel that the Foster/Smith shipment of blood worms that arrived cold but not frozen is the problem. Each case I've had is shortly after the blood worms.
I just can't figure out why it doesn't bother the younger fish. My last spawn just loves them and gorge themselves without a problem. The minute one of my adults touches them I have a problem. It is always with the males though. That's another thought.