I wouldn't want to go anymore coarse because you have to think that they have to pass this stuff through themselves. I got a black cuke from a LFS and they had very coarse CC when I got him home, he began to got through my sugar sand and when I first saw him expel the bigger CC he almost looked constipated and it shot out of him a couple of inches
. I really don't know how to get him on the bottom, is there even any food leftover for him to eat on the bottom?