Zoanthid and Paly Polyps - What Causes Some to be much Smaller than they Should Be?

that Fish Guy

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What Causes Some Zoanthid and Paly Polyps to be much Smaller than they Should Be?

For Instance usually the Average Paly Polyps are like 2 to 4 Times Larger than the Average Zoanthid Polyp.

Yet I have a Frag of Sunny D's Palys where are the Polyps are about a Quarter of the Size of an Average Zoanthid Polyp.

Then I have another Frag of Sunny D's in another Aquarium that has Polyps a good 10 Times the Size of the Polyps in the Other Tank and they are the Same Paly?

What causes this?

How can I get the Tiny Polyps to Look Big and Normal again?
 
if they are the same polyp then its a combination of flow and lighting.

what does what varies from polyp to polyp and tank to tank.
 
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