Indeed 747, I have seen that many times...Coco is VERY, VERY wet mix...if I WERE TO USE IT (and I wont), I would cut it with perlite as much as I do with vermiculite...80 %perlite, 20%vermiculite (coco in your case).....Do u have ALL PERLITE for the base of your container?...a #3 (or even #4)...