From ReefPedia

[edit] Tridacna maxima Common Name Great, Maxima or Rugose Clam Max. Size: 14 inches Tank Size: Due to its requirements for calcium and alkalinity, minumum 30 gallons for a small one, to make monitoring it easy. Aggression: None, but some fish have been known to be killed by the closing of its mantle. Hardiness: Advanced aquarists only, not for a beginer. Reef-Safe: yes Available as captive-bred: yes Hitchhiker? Possibly on some live rocks. Chances are slim.

T.Maxima

Physical Description

A hard calcium carbonate shell surrounds its mantle.

Distribution

reef tops or slopes, attached by byssal threads.

Taxonomic Stuff you know you Care About

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Behavior

None

Feeding

Feeds on phytoplankton, planktonic animals, and light. The animal is photosythetic.

Breeding

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Social Structure

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Additional Notes

Keep phosphate very low, less than .03ppm at all times. The low phosphate promotes calcification of the clams shell. High phospates will inhibit its growth. It is a known reducer of nitrate, but the effect is minimal. Perhaps 10 in 100 gallons would show measureable effects.