Cholla Wood for fish, plecos, shrimps or even hermit crabs aquariums! A great, natural way to lower and buffer PH. It also has benefit for shrimps tank and shrimp love to graze for bio film on the surfaces of the wood or hide in there while/after molting. The Cholla wood can be used to attach moss, Anubias or ferns for easier plant growing!
Simply boil or soak it, in hot water for a day to remove excess tannins and to make it sink. This is NOT necessary but only by the aquarist's preference.