My xenia used to pulse sometimes, sometimes not. I coulld find no rhyme nor reason to the differences. Somedays the Xenia looked like it was going to melt but next day it was big and bold as ever.
I had mine is a very high flow area and it grew like gang busters, as did my Anthellia. I've read they require iodide but I never dosed it, I just did my regular water changes and they did very well.
Doug
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