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Maxima Clam (Aquacultured) – Tridacna maxima

Common name: Maxima Clam

Scientific name: Tridacna maxima

Origin: Indo-Pacific (aquacultured)

Adult size: Up to 30–35 cm (usually smaller in aquariums)

Temperament: Peaceful

Diet: Photosynthetic (zooxanthellae) + filter feeder

Minimum tank size: 100–150 L+ (mature reef system)

Reef safe: Yes

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Aquacultured Specimen

This clam is aquacultured, meaning it has been sustainably farmed rather than collected from the wild.

Benefits of aquacultured clams:

• More sustainable and environmentally responsible

• Typically hardier and better adapted to aquarium life

• Reduced impact on natural reef ecosystems

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Overview

Tridacna maxima is one of the most vibrant and sought-after giant clams in the reef hobby. Its mantle displays intense blues, turquoises, golds and intricate patterns, making it a true showpiece in reef aquariums.

This species relies heavily on strong lighting due to its symbiotic zooxanthellae algae.

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Placement & Lighting

Maxima clams naturally attach to hard surfaces and should be placed:

• On stable rockwork (not directly on sand long-term)

• Under strong reef lighting (high PAR required)

• In moderate, indirect flow

Insufficient lighting is the most common cause of decline.

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Feeding

Primarily photosynthetic.

In established systems, medium to large specimens generally do not require additional feeding. Very small clams (<5 cm) may benefit from occasional phytoplankton feeding.

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Water Parameters

Stable parameters are essential:

• Salinity: 1.024–1.026

• Temperature: 24–26°C

• Calcium: 400–450 ppm

• KH: 7–9 dKH

• Magnesium: 1250–1350 ppm

• Nitrate & phosphate: Low but not zero

Clams consume calcium and alkalinity as they grow.

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Compatibility

Peaceful and reef safe.

Avoid keeping with fish known to nip at mantles, such as certain angelfish or butterflyfish.

A mature, stable reef aquarium is strongly recommended for long-term success.