By calcareous this means these alga are composed of or contain calcium carbonate, calcium, or limestone. They are a segmented algae that are stiffly calcified except for at the joints, which allows for flexibility in currents. Halimeda calcareous algae grow well in environments with high calcium, medium light, very low levels of nitrates and phosphates, and low amounts of iron in the 0.05 ppm range. These macroalgae grow upright, many preferring sandy bottoms for attaching their fiberous rootlike holdfast structures. In nutrient rich reef aquariums they may require thinning. Calcified green algae, particularly the Halimeda spp., are especially important as major contributors of marine sediments. The white sand on many beaches around the world are largely composed of the sun-bleached and eroded calcium-carbonate remnants of calcareous green algae. This calcified sand is deposited from natural die off and consumption by some marine animals, such as the Caribbean sea urchin and Parrotfish.

BROOD STOCK IS OVER 10 YEARS OLD AND GROWN HERE IN MICHIGAN, SEGREGATED AND PEST FREE.

Price is $7.00ea.

Halimeda Macro Algae Calcium.  This is a great and natural way to add calcium back into your system.  You will be surprised at how much 8 oz. is.  It will release into the system as needed, or grind it up into powder and mix it in. Shipped in 8 oz. bags. $3.99 per bag.

The Udotea species are calcareous fans, meaning they are composed of or contain calcium carbonate, calcium, or limestone. Because they are found in the same Family Udoteaceae as Halimeda sp., this makes them closely related and they can be treated in the same manner. The calcium content within Udotea gives them a hard fan with varying textured plates, and the plates often have lines of calcium carbonate deposits centered around the middle. Udotea usually anchor into sandy or muddy silt bottoms with a holdfast stemming from or around a single stalk.  Price is $7.00ea.

Brushes - Penicillus & Rhipocephalus sp. Penicillus are known as the Mermaid's Shaving Brush because of their brush or bristle-like tops. They anchor deep into sand beds by means of a very complex structure of root-like filaments. P. capitatus grows two to four inches tall with a long slender stalk, P. pyrifrmis has a shorter stalk with a flat top and grows to about four inches in height.  Price is $7.00ea