The "Patific" Ocean

[Pazil]

I am not sure what causes zoas to do this.. I have had 2 colonies almost wither away to nothing over the past few weeks.... Both had approx 40-50 polyps and are now down to maybe 6-10 each..... At the same time I have about 30 different types of zoas in the tank and all of the rest are thriving...even the ones right next to each of the mentioned colonies... Go figure.