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Old 09-13-2015, 06:09 PM   #1
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Acan Not Growing

I have this acan frag that I have had for about two-three months. I am a beginner reefer. I have noticed that it has not grown at all. Can you explain why this might be happening? My lighting is two T5 55 watt bulbs. They are bulbs that have regular light and actinic. (If it helps it came with the Red Sea Max 130C). The bulbs are about 5 months old. Here are my water parameters:
Temperature: 78.5 degrees F
Salinity: 1.024
pH: 8.0
Ammonia: 0 ppm
Nitrite: 0 ppm
Nitrate: 0 ppm
Calcium: 340 ppm
Alkalinity: 9-10 degrees dKH
Phosphate: .25 ppm
Magnesium: 1170 ppm
Dissolved Oxygen: 7 ppm
I was wondering if it might not be growing because the calcium is so low, along with magnesium, and the pH. It is 5 inches from the bottom and I canít really tell how much flow it is getting. Iíd say it is probably getting good flow. Also, to get the calcium up, along with magnesium and the pH, could I just add Kalkwasser to my ATO? Please help because I am getting impatient about not a single amount of growth! Thanks for all the help!
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Old 09-13-2015, 06:29 PM   #2
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Feed it. Acans love meaty food and ime are one coral that definitely benefits it.


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Old 09-13-2015, 06:35 PM   #3
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Feed it. Acans love meaty food and ime are one coral that definitely benefits it.


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I feed it every other day. Any other ideas?
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Old 09-13-2015, 06:37 PM   #4
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Acan Not Growing

How are your other corals? I just noticed your phosphate were at 0.25 which is pretty high and could limit growth


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Old 09-13-2015, 06:42 PM   #5
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Low calcium is a big contributor. I'd add the Kalk. But you don't want to add too much too quickly


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Old 09-13-2015, 06:59 PM   #6
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Low calcium and high phosphates. Phosphates slow the process of building calcium skeletons in corals.
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Old 09-13-2015, 07:47 PM   #7
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How are your other corals? I just noticed your phosphate were at 0.25 which is pretty high and could limit growth


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My Zoas seem to be growing another little polyp every week or so. I just recently added a mushroom coral that seems to be doing alright. Fully extends out I just haven't seen it grow yet.
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Old 09-13-2015, 07:48 PM   #8
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Low calcium is a big contributor. I'd add the Kalk. But you don't want to add too much too quickly


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What about the fact that the alkalinity is at its optimum level? Is it still alright to add kalk just slowly?
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Old 09-13-2015, 08:42 PM   #9
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My Zoas seem to be growing another little polyp every week or so. I just recently added a mushroom coral that seems to be doing alright. Fully extends out I just haven't seen it grow yet.
Soft corals don't use calcium to grow like LPS and SPS do so the phosphate levels won't have as major of an impact on growth when it comes to preventing calcium skeletal growth.
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Old 09-13-2015, 09:03 PM   #10
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Soft corals don't use calcium to grow like LPS and SPS do so the phosphate levels won't have as major of an impact on growth when it comes to preventing calcium skeletal growth.
So I should just lower phosphate and add calcium in kalk even tho the magnesium is low? I have heard that if the magnesium is low the calcium can precipitate. I use the Red Sea coral pro salt and it says it adds 420ppm of calcium. Could it be precipitating out?
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