Please don't get me wrong.
Mushrooms and zoanthids are great introductions to reefkeeping. I would not for a minute deny anyone the joy of seeing them grow and multiply in their tanks. The problem is the explosion of growth that can happen.(just ask Tony about his explosion of Purple Mushrooms, and me about the explosion of Red Mushrooms). When conditions are right these things can spread at an alarming rate. That is why I ask the question " do you really want more mushrooms"
