How fast do these spread?

[bluering09]

First one suppost to be Yellow and pink but camera no good.

Blood Red Zoas!

 

[blackjacktang]

It all depends on the water qulity and how much they are fed. My brown palys are growing at an everage of 8 polyps per week.

 

[clownfish11]

thats wrong..those things are a factor, but the species of polyp usually has a growth rate, and if you check on zoaid or the id section of the zoa forum theres growth rate..feeding and water quality help, but its not really the main thing to the speed of growth