with cheato this is not an issue. It will help the tank more then ever hurt it.
Not sure why everyone keeps saying caluerpa releases toxins, what I have read about them is they release stored up nutrients back into the tank and or spores. Is this good not really but should not harm the tank IMO
. I say this having first hand experiance with grape caluerpa going sexual in my reef tank 3 times and mexicana in my fowlr
once (yesterday) it harmed NOTHING. So do not worry...
If the tank is small then there is a posibility that there could be issues with the health of fish because the spores a consume the O2
in the water.