Sinularia - How toxic

[I have a sinularia that is thriving. Borneman's book says its particularly toxic to LPS, but the frog spawn and bubble corals about a foot or two away are doing fine.

However, the finger leather, toadstool and xenia nearest to the sinularia are not doing well. Could the sinularia's toxic warfare be the cause - even though the 2 leathers are in the same family? Or should I look for other causes?

They've all been fine together for about 6 months - this is a recent development.]
 
[Yes, Sinularia will affect other corals in the tank adversely. It is one of the most potent corals and some can't handle it over a long period of time.]
 
[I noticed half my Xenia colony died off but i thought that was due to me raising my salt level. Maybe it was the Sinularia?
My other corals seemed to be doing nicely.]
 
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