Sherlock Holmes anyone ?

[Buccaneer]

I guess it is " possible " that the bucket had something in it ??? been using these buckets for some time tho so unlikely but you never know.

I only siphoned about 25% - 30% of the sandbed ... I also have a sump and a refugium witha DSB and about 450 LBS of Live Rock so there should be enough left to handle a relatively low bioload

I checked the pods/bristle worms/bristle stars in the tank / sump / refugium and all are OK so whatever got my shrimp / fish had to dissapate rather quickly and also why did it not affect the other fish ?

Is there anything in the sandbed that could be toxic that I have not tested for ? ( dont have a test for orp )

Thanks for the ideas so far

Cheers