I have a tonne of Large pods too. I've seen them do the same thing but I'm never sure if they are the cause of the zoa death.
My tank observations. I have a 90 gallon with a 75 gallon sump. I have a very large fuge with tonnes of pods to feed my six line, mandarin, and scooter blenny. All have been fine for just under 2 years together.
Something died behind the rock work about 8 months ago (a five year old lawnmower blenny) while I was away. I had a bad hair algae outbreak. I left it for awhile and en finally decided to get rid of the hair algae.
I started to feed very sparingly and clean the tank weekly of detritus. Cleaned the sump and tidied up the fuge. I did some massive and frequent water changes and I'm sure the nutrients in the water were quite low. I think this caused the pods to want to eat stuff. This is when I noticed that some zoas started melting and the pods started attacking the zoas. I don't know if it was the lack of nutrients in the water that cause the zoas to die or if it was the pods who ate them.
So in short, in my tank. When I fed sparingly.. The pods may have been desperate for food. Not sure though.
Good luck.
BTW, I love my six line. He cleans up the tank very well.
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