Temperature affects on Zoos/Xenia?

gatorcsm

Member
I am going out of town today (only for 3 days) and earlier this week I decided I'd try putting the covers on the tank to see if I could get my evaporation rate down for the couple of days to make sure I'd have no problems. Any way, over the course of the day temp got to 84.5 and so I removed the covers. There weren't any visible problems. The following day, however, I noticed a few zoos and a small section of the xenia not looking so good. It now appears a larger section of zoos are sorta dying back. Not the whole rock, but just about 10-12 of the polyps have changed color a bit and look sort of shriveled.
The xenia that died were smaller stems that had just started to branch away on the rock from the main part of the colony. The rest of the corals have been doing great and all specs are in good standing:
1.024,
Ammonia/trites/trates=0/0/.2
Calcium = 430
Alk= 2.91 (slightly low, (usually around 3.4/5)
Magnesium=1275 (slightly low but very close)
Temp (now) = 81
Temp usually around 79-81
The rest of the corals are looking fine. Having a little die off in some damaged areas of the closed brain i just got (necrotic tissue loss?) but apparantly it's usually from collectioin and transport stress.. Hopefully it will/can begin to recover soon.
It began about a week after putting it in where one corner in the back would have pieces start to loosen and 'fall off' the skeleton. It is still receding some in that area, but is so far limited to the corner. Most of the areas that have any damage appear to be areas easily damaged during shipment/handling such as high spots or places that would have obviously been grabbed during collection...
Any ideas/comments on any of these occurences would be appreciated. Any suggestions on the brain would also be great. It's in the top third of the tank (90g AGA (24" high)) with 440w VHO (2 actinic/2 aquas). Nightly has been putting out feeding tentacles and accepting mixture of meaty foods.
Other corals in the tank that appear fine are a frogspawn, the rest of the xenia, some different types of zoos, clove polyps, blastamussa, two colonies of green star polyps and two different ricordea rocks.
Thanks,
Gator
 

bang guy

Moderator
Hi Gator,
A sudden jump and dump in temp is pretty stressful. If you've got everything under control now then it should all recover. If you're still experiencing temperature spikes then I suggest you set you heater to keep the temp a bit higher, perhaps 83-84. That way the variation isn't so great. Your corals will do fine long term at that temp, it's the fluctuations that cause them damage.
I believe you're on the right track with your brain. Perhaps someone more familiar with closed brains can chime in with suggestions.
 
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