Fritz Nature Box contains Indian Almond leaves, sliced Catappa almond bark, and Casuarina cones, each giving a unique application of tannins, humic acid, and habitat.

Natural décor items are commonly used in the hobby to create blackwater biotope aquariums, as shelter for fish, shrimp, and fry, as well as for their healing properties. They provide shade, sites for bubble nests, spawning sites and hiding places for fry, and food sources for many ornamental shrimp species. Catappa Leaves also add tannins, lower pH, have anti-fungal and anti-bacterial properties, control pest snail populations, and enhance coloration and increase spawning behavior.