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Old 12-18-2012, 08:59 PM   #1
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zoanthid buttons not wanting to grow

Mates,

I've been having issues getting my zoathids to spread. I've had this tank in this configuration for about a year and a half now. About 4-5 months ago I almost killed off these buttons due to the lights being old. So I went ahead and bought some new T5H0 Purple and white bulbs and they seemed to be making a recovery. A new coral actually grew up out of the same live rock piece that I bought with them on it. I have them up at the highest point in the tank tucked into a rock because my urchin acts like a bulldozer to anything that isn't secure. About a month ago I noticed that growth had stopped and this week many of them have been closing up.

I can't figure out why these guys aren't growing please help.

Tank info
Two side hanging filters and a pump for water flow.
Lights T5HO purple and white bulbs ~5 months old
Ammonia <.25
PH 8.0
NO2 Nitrate <5
Nitrite 0
Salinity 1.023
Alkalinity N/A
Calcium N/A
Water temp 78-9

Tank mates
Hermits
Various snails
Sunflower (Yellow Flowerpot) coral at the bottom of the tank
Blue Damsal
Sea urchin
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Old 12-18-2012, 10:21 PM   #2
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How about your PO4?

Where are they in the tank, and what kind of flow do they get?
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Old 12-18-2012, 10:30 PM   #3
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They are top center and get moderate flow. I'm not sure what the PO4 is don't have a test for that.
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Old 12-18-2012, 10:32 PM   #4
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That could be a factor. Once PO4 gets above 0.03 or so ppm, it can seriously inhibit coral growth. If you plan to keep coral, I would get a PO4 test kit. At the least it would rule it out as a cause.

Have you tried moving them at all in the tank and getting a different flow/light combo to see if it helps?
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Old 12-18-2012, 10:39 PM   #5
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Po4 is phosphate test kit.
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Old 12-18-2012, 11:24 PM   #6
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It was doing fine before so I'm thinking its prob not flow or light. I'll buy a PO4 kit and test if they are normal I'll try moving.
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Old 12-18-2012, 11:48 PM   #7
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Next thing to check is Alk and Ca. Make sure they are also stable and within acceptable range. If it is swinging a lot, especially when you do a water change, it can inhibit growth.
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Old 12-19-2012, 01:13 AM   #8
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I had a few zoa's not opening than a friend told me to try blowing them out lightly with a turkey baster , sure to my demise I found a nudi hiding in them
since than they are the most colorful zoa's in my tank
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Old 12-19-2012, 11:37 AM   #9
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Woke up this morning and tried looking for the Nudi but couldn't find anything out of the ordinary for my tank.
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Old 12-19-2012, 04:08 PM   #10
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so got back from the aquarium and PO4 results came back a little higher than 0 and ALK can CA came back fine. Bought some phytoplankton in a bottle to see if he isn't getting enough food.

Boy would I feel stupid if it wasn't doing well because I was starving it.
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