It,s the common grape caulerpa racemosa. It has a flat shape now but eventualy will return to its usual round form. I had some that were like yous with the flat top and I thought it was something different but eventualy they returned to their round ball shape.
bad? depends...I never managed to make it grow in my tank while the other caulerpas grow like weeds. Some people say it is very invading and me...I could not make it grow at all.
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