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if it really is a frogspawn it will have sweeper tenticals that will sting the xenia.. you will be able to see if that becomes a problem (the xenia should try to retreat from the frog if that happens or it will have a dead spot by it)..
I think I see what your talking about.. it looks like it could be a frogspawn or maybe another LPS.. you might want to try to move it before there becomes a problem..
frogspawn are recomended to have 6 inches of space away from other coarls (other then the hammer that can live with it, its related)