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Originally Posted by StirCrazy
Go ahead and break them as they are single cell algae and do not spread spors unless they are going sexual. there were wives tales going around that if you break them they will spread.
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No wive's tale in my case, even though I am a wife
I did exactly what deep6er ended up doing - scraping all the empty shell off the rock, followed by several rinses. Over several months and several attempts to get rid of the valonia, with the stuff spreading more and more each time I disturbed it, I ended up boiling the whole lot of rock to get rid of this invasive pest. Luckily, the tank affected was only a 42g.