Crown Thorn Pods are a unique botanical with sharp edges, these can be left or broken/files down if being used in aquarium and harm to fish/invert is a concern

They are benficial for their tannins (recommended to lightly boil first, the longer you boil the more tannins you will lose. It I'd also a great place for the growth of biofilm. They have many nooks and crannies so that there is always food that only baby shrimp can get too.
 
Boil 5-10 minutes before use, the longer you boil the more tannins you will leech out. (they may tint water slightly but tannins are beneficial for all aquatic life)
 
Quantity: 10