Mystery Help

Over this past week there has been two rather perculiar things that have happened. On monday i went to the lfs and bought a black and white clown along wth a perc clown. I brought them home to my 75 gallon reef and they seemed to be happy as larks, both ate great and where constantly swimming. Wendsday morning i looked in the tank and the smaller perc clown was no where to be found, I figured he was hiding but when he didnt show up all day i ended up finding him in the filter sock. Could a healthy fish get sucked up by the filter or was he dead before? Friday i bought 2 bangai cardinals they both seemed to be doing great this morning i looked and one of them was missing after searching and searching i found he was being eaten by my fire shrimp.
Nitrates 0
Nitrites 0
calcium 600 too high i know
salinity .024
phosphates forgot number but were low
I have 1 fire shrimp, 1 fire fish, 1 black and white clown, 20 nas snails, 5 turbo snails, 2 differnent zoo colonys, 1 leather, 1 brain, 1 frogspawn, 1 pulsing xenia, everything seems to be thriving. Could i have a predator in the LR?
 
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