Species description

Care, breeding and tankmates

Plant profile

Placement

Midground

Commonly placed in a refugium for nutrient export, or in the main display tank as ornamental macroalgae. It requires moderate to high water flow to keep detritus from settling on its branches. Ensure it has enough space to expand its bushy structure.

Botanical form

Algae

A striking red macroalgae characterized by its heavily branched, fleshy, and somewhat brittle structure. It forms dense, bush-like clumps that provide shelter for small marine life. The branches are cylindrical and tapering at the tips.

Growth

Medium

Exhibits a fast growth rate when nutrient levels are elevated and lighting is adequate. It can quickly double in mass under ideal refugium conditions. Regular harvesting is necessary to export the absorbed nutrients.

Substrate

Low

Gracilaria parvispora is a marine macroalga that does not possess true roots, absorbing all its required nutrients directly from the water column. In the aquarium, it can be left free-floating or gently anchored to inert substrates, live rock, or coarse aragonite sand using thread or glue. Substrate depth and composition are largely irrelevant to its health, as long as it receives adequate water flow to keep its delicate fronds clean and nutrient-rich.

Column fertilization

None

Relies entirely on elements dissolved in the water column for its nutrition. Dosing trace elements, particularly iron and manganese, enhances its vivid red pigmentation. It helps maintain pristine water quality by outcompeting nuisance algae for nutrients.

Root fertilization

None

Does not possess true roots and therefore does not require substrate fertilization. It anchors itself to rocks using a holdfast or can be grown free-floating in a tumbling macroalgae setup. Sand beds do not provide direct nutritional benefits.

Trimming

Occasional

Prune by simply breaking off portions of the branches by hand or with scissors. Frequent harvesting promotes continuous growth and maximizes nutrient export. Removed portions can be fed to herbivorous fish like tangs.

Propagation

Fragmentation

Easily propagated through fragmentation. Any broken piece can continue to grow and form a new clump if provided with proper conditions. It can be attached to rubble using a rubber band until a holdfast forms.

Sensitivity

Sensitive

Sensitive to sudden changes in salinity and temperature, which can cause it to bleach or turn mushy. High levels of heavy metals or medications containing copper are toxic to it. It requires sufficient flow to prevent cyano or detritus buildup.

Layout role

Macroalga / Refugium

Provides a brilliant splash of red color and intricate texture to the display tank. In refugiums, it functions primarily as a nutrient exporter and habitat for copepods. It adds a natural, dynamic element to marine setups.