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sorry was checking answers on my phone and accident skipped over most of your answers... rules out pest because I used a flashlight at night and a mag glass to search for them.. but truth be it there could still be some ... i used saltwater master kit to test it checks multiple parameters but...

Thanks everyone for chiming in .. so Im guessing its a light issue ... So the zoas in my refugium with a cheap 15w led light are doing great !!! the ones in the main tank are so so ..my guess is the led is to much for them .. or maybe there are little bugs in the main tank irritating them that...

alk kit comes tuesday amazon prime... so maybe I will bump this thread pending the alk results

likewise I have read through the forum as to not ask questions that have already been asked but figured if I put up my parameters it might clue someone to something

they all close ... and I have prob 20+ different type of zoas...

Ill take your advice and do the water change in the means time.. but being that I have no fish and I do 20 % changes per week I kinda feel like the tank is clean but wouldnt hurt... I use reef crystal salt... maybe I should go a bit higher end on the salt?

I put new ones in the tank from the Frag swap yesterday and they are open but slowly shutting up ..the ones that have been in the tank for months keep going through the cycle of open then closing for a few days Etc ... the tank is about a year old

My Zoas seem to shut for a day or two then open then partially open then close I don understand why ? its a 30 gallon tank with a chiller ...nothing else in the tank except a few hermits and snails I have ruled out parasites ..here are my parameters ... Nitrate..0 Ammonia 0 Nitrite 0 Calcium...