Source: Wikimedia Commons
Giant Clam
IntermediateTridacna sp.
Bivalve with brilliantly colored mantle. Photosynthetic and requires strong lighting. Jewel of the reef tank.
Difficulty
Intermediate
Temperature
24〜27℃
Lifespan
10+ years with proper care
Size
5-30cm (varies by species)
Diet
Primarily photosynthesis + trace elements
About
Giant clams (genus Tridacna) are the world's largest bivalve molluscs, housing symbiotic zooxanthellae in their iridescent mantles to derive most of their nutrition from photosynthesis. Native to shallow reefs of the Indo-Pacific, Tridacna gigas can reach 1.2 m in length and 200 kg. Mantle coloration spans electric blues, greens, golds, purples, and browns, making giant clams prized display animals. Successful husbandry demands intense lighting (300–500+ PAR) and stable reef chemistry—calcium 400–450 ppm, alkalinity 7–11 dKH, and magnesium above 1280 ppm. Starting with juveniles (3–5 cm) eases acclimatization; large specimens are placed directly on the tank floor.
Source: Wikipedia (CC BY-SA 4.0)
Basic Info
Origin
shallow tropical reefs of the Indo-Pacific
Lifespan
10+ years with proper care
Size
5-30cm (varies by species)
Temperature
24〜27℃
Diet
Primarily photosynthesis + trace elements
Care Guide
Lighting
Strong lighting essential (metal halide or powerful LED)
Water Quality
Ca 400-450ppm, KH 7-11 required
Placement
Upper tank where light is strongest
Growth
Slow but steady growth
Notes
Do not forcibly detach byssal threads
BivalvePhotosyntheticColorfulStrong light needed
Giant Clam FAQ
QHow difficult is it to keep Giant Clam?
A
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
QWhat is the ideal temperature for Giant Clam?
A
The ideal temperature for Giant Clam is 24〜27℃. Avoid sudden temperature changes and maintain a stable environment.
QWhat is the lifespan of Giant Clam?
A
The average lifespan of Giant Clam is 10+ years with proper care. With proper care and nutrition, they can live a long and healthy life.
Giant Clam Q&A
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