shrinking zoas

[Nap]

I have a bunch of different morphs of palys and zoas and over the last month I have noticed that they are shrinking. When I say shrinking I don't mean that I am losing the colony or that there are less polyps...I mean the actual zoas are smaller than they used to be. I had some common green palys that were about nickle-sized in another system and started out that way in mine. A week later they are open and appear to be sprouting some babies but they are distinctly smaller than they used to be.

Another example is a frag of green radioactive dragon eyes that I was given six weeks ago. I started out with two zoas but they have very rapidly multiplied. They have grown a mat with approximately 8 new babies in only 4-6 weeks. I am happy with the growth but concerned that the original "parent" zoas have gotten much smaller than they used to be. They started out about 1/2 an inch across but are about 1/4 now.

My system is a mixed 120g reef with 378w t-5 lighting (aquactinics constellation fixture). The water parameters are
Ammonia-0
NO2-0
NO3-0
Ca-420
Mg-1260
Alk-903
PO4-0
Any ideas? Or should I not be too concerned?

 

[Reefman79]

I have zoas come & go all the time, like what your saying they just shrink away no reasons, what qualitys are good, good water flow, killer lighting ext...

Do what you can but dont freak out its just this hobby time will only tell...

 

[Nap]

I have been in this hobby for a long time. I know the ebb and flow of it all but I don't want to just sit back and accept the possibility that my zoas will vanish.

 

[Reefman79]

It happens some times no matter what you !

 

[Skeptic_07]

Maybe its the nutrient levels being 0.

 

[Nap]

I had considered that but I've never had zoas shrink while multiplying. That's the odd part of the whole thing that just makes me confused.

Edit - I've even been dosing Vit-C lately and haven't noticed any change.