Keeping leathers and SPS together is tricky, but possible. I have a big yellow tonga leather in with a bunch of SPS. As mentioned, the key is to run carbon, have good flow and good skimming. Having 150+ gallons of system volume doesn't hurt either.
On the other hand, I could have saved myself a lot of headache and just separated my softies and SPS, but I have absolutely no discipline when it comes to livestock purchases
