My ponies drag their tails across zoanthids, green star polyps, brown button polyps, and even brown mat-colony polyps (real thick rubbery kind) and have never shown any reaction to them. They also hitch on the Xenia, which sometimes seems to bother the Xenia, but never the ponies.
I personally didn't want to try any leathers because in the past, they've always gotten HUGE in my systems and every time they had a 'growth spurt' they shed waxy crap all over the tank. MAYBE once I cut in Sumpzilla, and have super skimming and more water, I'll try a leather. In any case, most people on Seahorse.org who have leathers in their pony systems report no problems.
Have you seen the compatibility chart on Seahorse.org? It's pretty good and is a compilation of information from all the keepers who wish to provide feedback. I have found it to be 100% accurate.
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