Quote:
Originally Posted by gareth.hubbarde
Think so. 
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Hard to see from the picture. It is generally not easy to see unless the clam retracts its mantle. Generally, it is easier to see it when the lights are off since clams partially retract their mantes during the night. It is normal for newly acquired clams to sometimes not have any new growth (shipping stress, new lights and etc.).Try to keep a record of how much new shell materiel is added per month. A young clam like that should grow rapidly for the first year or so. If it doesn't show any shell growth for a month, it indicates it is starving. If so you might want to move it up.
New growth would be very clean white like porcelain (and should be outside of the shell, shell is always white inside). It should look something like this;
