"Coco Curls" as they're known in the hobby, are pieces of coconut shell. They are very attractive in any tropical blackwater aquarium set up, and produce A LOT of tannins! Shrimp and some fish love to graze on these
Preparation: We recommend boiling these for a while, they could take an hour or longer to water log; then soak for a 2nd time in cold water, to allow them to cool down before placing in your aquarium. We prefer to soak for at least a few hours.