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i just noticed today that there is a very small tan looking polyp on my live rock and i was wondering if a mushroom can be seeded in ur tank with out ever putting a mushroom in the tank?
It all depends where the rock came from before it was put into your system . Anything and everything can pop up from live rock . Google a picture for aptasia,if that is it remove the polyp,they will spread real fast . Hopefully it will be something good.
if you do get aptasia or the mojano anemones poppin up i suggest joes juice or peppermint shrimp (or both). i have been told from many people that if you cut the anemone or scrape it off it will release clones into the water.