Peat free substrate for Mexican pinguicula?
I'm curious if anyone has success growing their Mexican pings in peat-free substrate? I have always had issues using peat moss in substrates for my tropical and carnivorous plants, so I now only use it in my pinguicula substrate because it seems to be universally recommended. But I worry that my ping mix is too peat-rich because i have lost a few pings using it (not sure if peat is the only issue as I may have been overwatering at times, but I feel like peat encourages mold growth and fungus gnat eggs which have both killed some of my pings).
However, I'm nervous about trying peat-free substrates for my pings because of the lack of info online. I know that a 1/1/1 ratio of sand/perlite/vermiculite is sometimes recommended, but others say that vermiculite breaks down too quickly. Has anyone had success with just a sand/perlite/pumice mix? Maybe with sphagnum moss to help with water wicking?