Yeah derasa is by far the most resistant to diseases. Maybe DD has been aware of the situation and taken actions to correct that.Ah. Yeah, that would be a little concerning. I'm not overly worried about the derasa that it's in with. I've had it for a couple of years now but it's nothing spectacular. Would still suck to lose either of them, but I'd be a little more worried if I had some expensive clams in the system already. I feel relatively safe as it was a cultured specimen.