I would reccomend you choose your species well in a smaller tank, otherwise run lots of carbon because various leathers have differing toxins and some dont get allong.
iN my experience i have tried several combinations with varying luck, so i will give u a list of what i have found does and doesnt get allong.
Here are some bad combinations i hav noticed
Devils hand & sinularia aggravate Lemnalia and (i still havnt properly identified my green finger but it is sparsley polyped, and thin branched.) as well as colt coral.
The current combinations i have been growing for the last 2 years in a 48 gallon are...
Sarcrophyton, (again the green leather), Cabbage, colt, lemnalia, and Cladiella.
Devils hand and dura get allong with sarcrophyton
Most long branched finger leathers get allong just fine.
The more toxic softies are sarcs, devils hand, duras, and cabbages.
I hope this helps. Trial and error is really the only way to tell for sure.
I would run carbon in your filter most of the time, if not atleast for a week once a month.