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Subscribed.Hi,
Thanks for the responses. One of them suggested dropping a small amount of Seachem Acid Buffer, onto the disc. It seemed to kill the algae instantly. I have rinsed twice with tank water, and soaked them in Prime. I will post the results for those interested.
I used to use h202 but it didn't seem to do much. I was scared of bleach because, if it would soak through the ceramic, how would you get the bleach out? It never occurred to me to try Excel and I usually have that on hand anyway. Seachem Acid buffer - sounds interesting.