Thank you. Those bladders are from U.longifolia which has become a huge pest in my Nepenthes collection. The tuberous Drosera are in a mix of about 3 parts sand to 1 part peat. I'll be trying some in pure sand this year though.
Man, I wish my longifolia did that. I guess my growing conditions just aren't good enough. None of the weedy utrics are weedy for me. I'll probably be repotting my tuberous sundew after this growing season is over too. I'll try your growing mix.