Mine left all existing corals in the tank alone including zoas. But any new lps other than euphyllias were toast.
I wouldn't trust it in a reef, but the price is great!
I scored this beauty about 9 months ago for $130.
LFS in Mesa AZ. Was still juvi, now changing.
They have one in now that is twice the size, but its $400.
I'll wait for mine to grow at that price.