i just started growing with hempy buckets (i love it so far by the way) and i spent days and days online trying to read all i could to see what mixture i should use. i was in between coco, 75%perlite/25%verm, and 100% perlite. after all my reading i ended up going with the 75%perlite/25%verm mix. coco had a lot of people saying good and bad about it in hempy's and same with 100% perlite. the 75%perlite/25%verm mix was the one that i always heard good about everywhere so that's why i chose it. i will certainly try coco on a few the next run if i like the flowering results from this run though.