Probably so. But lie once. Lie twice. Lie again. I'll drop it
Give a guy a break. He probably panic when he is seeing CRS disappeared after it went into a tank with fish. Chances are, some went hiding and others were eaten. There were a few really tiny ones.
This is a 40gal tank, I would have problem spotting CRS too unless there were like in there. Now that the fish are gone, concentrate on the water..