nutrients, how to tell if to much?

[mark]

Measured out the flake on this evening's feeding and probably closer to 1/4 tsp.

Up until a little while ago had a cleaner and peppermint shrimp and a couple of Emerald crabs I never see. Lost the shrimp with the Interceptor and not much hope for the crabs if still even around.

Tank I'm running BB with ~4600gph flow and ~1000gph of that through the drains so think the filter socks, skimmer, the sump itself and refugium should catch a lot that the fish miss.