One thing the blenny probably did was eat all the pod food. Pods
also eat algae, and as it was eaten by the blenny, your pod population also would have dropped. Thereby starving your manderin.
I like to suck pods
out of my sump chaeto ball with the turkey baster and shoot them into my DT rockwork. I do it either right after feeding my fish in the day when my sump lights are off (easier to catch pods
) or right after the DT lights go out so the pods
can get into the rocks better. My hope is they reproduce better thereby keeping my pod population up.