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Old 07-22-2003, 03:10 PM   #1
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coralline algae dieing

Has anyone heard about coralline algae dieing off in a well-established tank? the tank has been up for 2.5 years and 40lb of the rock and coral were also in a smaller 40 gal tank previously. No signs of disease it just seems to be less and less. It used to be very thick; nearly 95% of all the rocks that were exposed to the light were covered. But now there is about 45% covered with some rocks completely bare of it. All the fish and corals seem to be healthy and growing.
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My system is a 90 gal, reef, with 20 gal sump. Plenum style filtration 3’ of sand and 90+ lbs of live rock. 4 96w power compacts. Many different corals and fish.
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Old 07-22-2003, 03:54 PM   #2
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What are your calcium and alkalinity levels?
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Old 07-22-2003, 04:22 PM   #3
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In addition to Bob's questions, what is the the size of the tank and what is the tank lit with?
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Old 07-22-2003, 04:40 PM   #4
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Have you seen any of these roaming in your tank? They've eaten all the coraline off one of my rocks and from what I've read they like coraline algae

The rock in the picture isn't purple anymore.
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Old 07-22-2003, 04:41 PM   #5
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RR ~ Check his sig:

Quote:
90 gal, reef, with 20 gal sump. Pentium style filtration 3í of sand and 90+ lbs of live rock. 4 96w power compacts. Many different corals and fish.
Doesn't sound like lack of lighting is an issue. I'd suspect ca/alk levels as well.

Btw, what is this?
Quote:
Pentium style filtration
How are the corals doing?

Any urchins in the tank?
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Old 07-22-2003, 05:15 PM   #6
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Quote:
Originally Posted by ReefLady
RR ~ Check his sig:

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90 gal, reef, with 20 gal sump. Pentium style filtration 3? of sand and 90+ lbs of live rock. 4 96w power compacts. Many different corals and fish.
Doh!!

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Btw, what is this?
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Pentium style filtration
I was figuring Plenum for Pentium
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Old 07-22-2003, 05:26 PM   #7
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The calcum is usualy 400 to 425 range. Alkalinity is a little low I havent been able to get that to stabilize consistantly. but I do add suplements on a regular basis and the corrals seem to be growing and healthy.

I havent notice any of the little criters that Salt4Us ponted out I will have to look for them.
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Old 07-22-2003, 05:38 PM   #8
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no urchens are in the tank.

The rock after the coraline is gone us left usualy a green brown color. It looks like rock that is recovering from being bleached but with out the white bleaching look that urchens useualy leave.
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Old 07-22-2003, 10:06 PM   #9
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Anything that actually eats corraline is the best thing to get the corraline to grow. When the poop they spread all the algael spores, and thus spred the algae. I have a coupe of questions for ya to Have you increased the lighting at all since you noticed this decline?? Are you sure the corraline is not under this green or brown film??and how bad is your alk?

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Old 07-23-2003, 12:11 PM   #10
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The alkalinity is somewere around 6 to 8 dKH. The test kit I have is a Kent Im thinking about replacing it with something more acurate.

The greenish brown rocks (absent the coraline) arent not slimy its just green and brown algee. It looks like the same stuff the rocks have when thay are new to the tank defor coraline takes over.

As for the lighting I just replaced all 4 bulbs about 3 months ago.

Do you recomend that I try geting a uchen, or would it just eat the reamaining algee.
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