A torch is ok with most everything as long as you give it room, Leathers can be kept with sps. I do it. However, they can be toxic. I run carbon but carbon may not be very effective against the allelopathic metabolites put out by leathers since they are rather long complex organic chains with potentially little affinity for absorbtion by carbon. So , yes you can do it. Yes, run granulated activated carbon. Yes. you are taking a risk.