Actually, I thought of that. Why else would things be going as they are. I trusted this LFS
because they were the biggest around, and they told me specifically that I could start with three chromis and a cleaner shrimp at one time in a 40B, a week after the cycle ended. I think it was just too much at one time, It looks like my last chromis may not make it. He is just hovering beneath the skimmer overflow box. Again, he did not eat, unless when he briefly went into the rocks to avoid me.
One good thing, Sniperhank told me to put carbon in the skimmer overflow in order to clear the tank, and it seems to be working. Much clearer today.