Just to clarify..If you are using a cheap coco it probably would be beneficial to use perlite because the crap coco contains a lot of dust it's actually second grade fines that is prone to compaction...Good quality coco has a high percentage of fibre strands. If you look at coco under a microscope it's hollow like a straw. My observations are related to high quality canna coco pro plus..I've done side by side using various mixtures with perlite, vermiculite, clays and never found any variation to be any better than using good quality coco on its own..
Regards BL
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