Massive bristle worm death

pixelhustler

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A couple of days ago I noticed a bunch of bristle worms out during the day, laying on the sand bed and rocks and barely moving.

Now they’re dead and I’ve been vacuuming them slowly. What could cause such large sudden death? Everything else is fine including snails.

The only change is my lanthanum dosing pump ran out of lanthanum for a few days. Phosphates must have risen because turf algae took over fast.
 
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