I noticed some marking on the outer left edge of my letposeris. It has grown close to my Goniopora.
-Is the Goniopora stinging my Leptoseris?
-if so Will this affect the rest of my Leptoseris?
-Is there anything I should be doing.
Yup, looks like they're fighting. The parts that the goni touch will die off, the rest thats growing away will be fine. It shouldn't kill the whole coral. If the goni is still on a frag plug you could try moving it farther away.