Depends on the zoas I think. Most of mine grow at about a polyp every few weeks. However, I have a colony that is not invasive by nature but is growing about 1 polyp a day! It just all of the sudden started to go insane. Bigger palys tend to take longer it seems. I have a new colony of P. grandis that has had about 6 nodules at the bases for a week now and are still not discernible as new polyps yet. Also, I have some other palys that have put out 6 new polyps ( took around 2 weeks total) for them to form and they are still maturing. I don't think they will put out new polyps until the younger ones are more mature.
NSW= Natural Sea Water.
And in my opinion all are different. I have some zoos that pop off a couple babies a week. Then I have some that may only pop one out 1 a month.
Cheers
No two systems are alike thus neither will produce the exact same rate of growth, expansion and/or appearance. Your tanks's maturity, parameters, lighting, flow and nutrient levels are the variables which will dictate everyone's rate of growth or no growth at all. Good luck.
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