Zoa colony closed up

HockeyRooster

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I have a 54 gallon tank with about 60 lbs of live rock. I use a canister filter (with only live rock in it), a wave maker and an in tank skimmer (tiny little thing). I have 5 fish, Halloween crab, cleaner shrimp, 2 peppermint shrimp (I haven't seen them in a few weeks), BTA and a cuc. Tank has been running for almost 2 years (but all live rock was taken from an existing system if that matters). I dose about a teaspoon of reef builder a week (and at water changes) and feed the tank a teaspoon of reef roids weekly. Fish feeding is a bit heavy but not ridiculous.

For coral, I have only zoas and mushrooms which until recently have been growing like crazy. I think my tank is a bit dirty but will admit I'm not great at testing on a regular basis. Recently one of my zoas (probably 40 heads) closed up. Everything else seems to be thriving...I even have a few new frags sitting on the sand which seem to be good-small but open most of the time (they've only been in the tank for a week). The closed zoa is bordered by another zoa (which I've read can be a problem)

Unfortunately I made a few changes to the tank all at once so I am not 100% sure what has caused this zoa to close up. The changes I made around the same time are:
-added 6 blue leg hermit crabs
-removed some live rock which changed the flow over said zoas-about 4 days ago I put a rock to reduce the water flow over the zoa (which makes the flow closer to the way it was previously.
-removed foam around the wavemaker (which I added due to the addition of the BTA about 6 weeks ago). I feel the wavemaker is at the same setting as it was prior to the foam and still moves as much water as it did with the foam as I turned it up when the foam was on.

I did a 10% water change two nights ago and a few of the zoas in question opened. I use Fritz RPM (blue) for salt.

So, I assumed that over time, my tank used up one type of mineral or such and that I needed to dose something. I did a lot of reading and I feel like my research says that zoa tanks don't need dosing (and I am dosing the reef buffer).

Any insight R2R? I appreciate any help you can offer.
 
Might just be the blue legs picking and eating around the polyps. Could also just be the change in flow they haven't adjusted too. Sometimes they will also close up if they start getting algae growing on the stem. In that case I usually just give them a gentle cleaning with a very soft toothbrush.
 
Any luck on getting these opened? I’m having the same issue. I did a tap water rinse and a weak iodine dip. Been closed for a week now while another zoa is open..
 
Sorry for the late reply. No news. My tank sprung a leak so they are in a temporary tank and things haven’t changed much.
 
So mine closed up for two weeks and I battled my nitrates down to a lower level 5 ppm and they opened back up. I think just time if the rest of the corals in the tank look happy
 
Oh zoas and I have a love hate relationship. I’ve got a bunch of colonies in my Reefer. Had some close up due to too much flow (Bam Bams). Some that hated the amount of light and needed to be moved to low light (Fruit Loops and Lakers). Had to dip a bunch in antibiotics due to an infection... yeah, beginner coral my butt... I’ve got SPS that require less attention.

All kidding aside, the flow could be a culprit. I’d check the salinity just to be sure. Had a number of colonies freak out due to it being low having a bad refractometer. I would also check CA, Alk and Mag just to rule things out. Take a flashlight to the colony when the lights go out and see if any pests show up. Sometimes, a pest will show up unexpectedly. You could try dipping them if you suspect pox, nudis or algae.
I’ve also heard good reviews on peroxide dips. But I’d be careful with the ratio used.

Phew, sorry for the long post. Hopefully some of that helps.
 

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