Crocea Giant Clam - B Grade (South Pacific) Marine Invertebrates The ultra Australian variety is

The ultra Australian variety is typically intense scarlet

if it is to be kept with other tangs it should be the last tang added to a sufficiently large aquarium

Ultra Australian specimens are always vividly colored and are more rare and impressive than those from other locations

and allowed to fully retract before removing from the water

Crocea Giant Clam - B Grade (South Pacific) Marine Invertebrates The ultra Australian variety isThe Tridacna clams are exquisitely colored, very uncommon and highly sought after. They make incredible display animals and thrive under reef conditions. They are peaceful and do not bother any other animal. If threatened they can close their shell tightly. Healthy animals should have a strong response if shadowed or touched, although once established they may become conditioned and show less inclination to close. They will attach themselves to rock