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Old 09-28-2009, 03:18 PM   #1
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Upset Xenia and Green Star Polyps

Hello all,
My GSP colony has been looking sickly for some time now (a month) and now my xenias are looking sick. The GSP has poor extension and only about half the colony wants to come out. The Xenias went bad over night. They are not closed up, but look tiny and white. When touched, they release what looks like white pollen into the water.
My water parameters:
Ammonia:0
Nitirite: 0
Nitrate: 0 (suspicious)
KH: 9dKH
pH: 7.8 (usually 8.2)
Calcium: 460ppm
Salinity: 1.025
Temperature: 78F

All other corals are doing alright. Even my Crocea clam is looking good. Fish are happy. Shrimp and hermits all happy.

The only thing that changed was some new trochus snails added a few days ago as well as putting purigen back in after recharging. I followed the recharge directions carefully. Added enough Prime and let it soak in the Prime+DI water for 12 hours or so before drying it out and leaving it for a week or so while I ran some clearmax for phosphates.

Cyanobacteria is on the decline, as is some hair algae. I just dont get it?
Xenias was doing great up till this AM. Star polyps were great for a few weeks, then slowly decline.

Matt
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Old 09-28-2009, 03:55 PM   #2
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need to get the pH back to 8.2
if you do your water test in the early morning, then that might be why your pH is a at 7.8.

and I heard that xenia tend to do better on warmer water.
I keep mine at 81.5~82F.

did u feed your corals?
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Old 09-28-2009, 04:04 PM   #3
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Hello,
Thanks for the reply!
Yea, I was surprised to see my pH low. It usually is 8.2 on the money. I will test later today and see if it raises. I also increased surface agitation to see if it increases pH.

I will turn up the heat on the corals.

No, I dont feed my corals. My tank is only 20g and it seems that feeding would cause me nutrient problems. Although I do have a bottle of Kent's Marine Zooplex.

Matt
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Old 09-28-2009, 04:11 PM   #4
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No zooplex. You're right, it will foul things quickly.
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Old 09-28-2009, 09:53 PM   #5
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Matt:

Looks like I am running into the same problems with my Xenia (getting short and white) kind of melting away and the GSP getting light green and short extension as well. Water parameters are good except the nitrate at 12. I do not get it and really do not know what to do anymore.... I am using Reef Biofuel from Brightwell to get the nitrate down but NO results. Still the same..
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Old 09-28-2009, 09:57 PM   #6
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Weird huh?
My Xenias are all but dead now. In a matter of hours, there is very little left! Although I am very sad about this, I am very intrigued! Maybe some sort of disease specific to them?

In a last ditch effort, I put my over powered lights back on the tank. (From another thread). Now instead of 96W they got over 160W of t5. We will see what they look like tomorrow.

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Old 09-28-2009, 10:07 PM   #7
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no ideas... I guess I am losing them as well. I would say the light may have been an issue. They were under 20K 150W MH and I did change my bulb to Phoenix 14K a month ago. Problem may be there...so do not get more light to your tank. I may be actually worse!
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Old 09-28-2009, 11:09 PM   #8
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I don't think the light is the main problem.
as GSP and xenia don't need a lot of light, I didn't even have a good light
I only have a 30W blight light and a 25W white light, and they r doing fine.

but! if your light bulbs r old, would suggest to change a new one.
I change my every 6~9months

do u have any invert in the tank?
It might be they nipping on your corals and made them stress.
this happened to my yellow ployps, the first day they opened up all high and happy, but after that night, it didn't open up till 8hours after I turned on my light, and I bet my hermits or peppermint shrimp have something to do with that.

so I will keep eyes on the invert if u have some.
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Old 09-29-2009, 09:04 AM   #9
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Believe me. I've seen some of the healthiest tanks where xenia doesn't do well. It's a weird coral. Sometimes, you really cannot figure it out.
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Old 09-29-2009, 01:39 PM   #10
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Hello,
I have some inverts, but none pick at the corals. Its definitely something specific to the corals. I have two places in the tank that had xenia, now they are next to nothing. (Still hanging on)

It really is strange...There are no other corals nearby that could sting them either.
Matt
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