Why are my AOIs so tiny??

[Luckyduck]

I've had these guys for probably 2 years. Very slow growers but more interestingly, why are they so tiny? Especially in comparison to the other flavors I have but they have always been this way. Nitrates are 8.7 Phosphates are 0.06. Currently running a little high because I'm fighting off Dinos. Alk 9.5, Calcium 450 & Magnesium 1357. They're getting medium flow as are the others. I'm assuming it's not a lighting issue as all of its neighbors are growing and multiplying. Am I missing something that I don't know about AOI Zoas?

 

[pochaxoo]

My experience with the AOI is that they take a very long time to acclimate to the aquarium you have and go through near death experiences and being ticked off as yours are now. Mine did not multiple for a year and then boom they acclimated to the light or flow and grew like any other weedy zoa. I think it may have a lot to do with the light level vs what you may have them in now and where they came from but not definitive. Good luck and hope they grow eventually.

 

[elysics]

On your picture they are not fully open and barely acclimated, but also they are a smaller species, not all zoas grow to have the same size.

There's even much smaller varieties than that