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Old 02/03/2018, 11:01 PM   #1
cdearing
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Are LEDs killing my corals?

I have a 75 gallon with 30 gallon sump. AI Hydra 26 lights. Last summer my LED lights starting doing weird things like certain lights in the pucks wouldn't come on or they would flicker. I didn't pay too much attention because I was so busy. By the time I realized I had a problem and called Aqua Illumination for help, I was in bad shape. The rep said I had to send them in to let them look at the lights so I spent $100 to overnight them. It was a hardware problem and I'd only had them a couple years. I had to buy new ones "at a discount". I didn't have a spare light so put a large plant growing light fixture over the tank for about 5 days while I waited for my new lights on the slow boat. Some corals have recovered but I lost all of my SPS, some really large colonies. Now my show piece coral, a super large wall neon green hammer that my clown hosts in is slowly shrinking. It used to take up about a quarter of my tank. I've been trying to adjust the lights up then down. I've tried target feeding it. Everyone seems to have a different idea online of where these lights should be. I haven't found anything that the hammer likes. My other hammers are also shrinking. Some corals seem to be just fine and thriving. Also the sand has a weird texture like reddish hard layer over the top. My temp is usually around 78.5-79. Salinity is 1.027. Calcium is 410. I have a PH monitor but battery is dead. Anyone have thoughts on what I can try to save the rest of my corals? I do not have a light meter and would honestly rather not buy one. I have so much money in this thing as it is. I'm attaching some photos. One is hammer a couple months ago to compare. Thanks for any help. Tank has been running about 8-9 years.
I tried posting on another reef site but no-one responded. Hoping someone will at least chime in here. Thanks!


Attached Images
File Type: jpg Tank2018.jpg (101.3 KB, 92 views)
File Type: jpg IMG_0663.jpg (52.0 KB, 93 views)
File Type: jpg IMG_0655.jpg (65.4 KB, 91 views)
File Type: jpg IMG_0656.jpg (66.8 KB, 85 views)
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Old 02/04/2018, 05:20 AM   #2
ReefkeeperZ
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definitely a huge help for answers would be test parameters for your water.
calcium alk mag (I did just notice you listed calcium and specific gravity but more info would be really helpful)
Changing lights can be really hard on corals especially with the intensity of LED it can take a up a few weeks for corals to acclimate find a position for them and leave them there if you keep changing the location intensity the corals have to burn energy trying to adjust to the different lighting conditions.

the weird reddish layer is probably cyanobacteria


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Old 02/04/2018, 07:17 AM   #3
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yes... post more parameters.. alk/nitrates/phosphates,etc...
and give an indication of how stable you have kept them.. corals enjoy stability over anything..
tell us your lighting schedule (how long..what percentages,etc...)
what is your water change schedule? how much..how often..
feeding?
etc...?


photo 4 seems to show most of your corals look pretty bleached.. is that just the photo or are they?


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Old 02/04/2018, 01:37 PM   #4
jda
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The simple answer is that they will not do it alone. I do think that hard corals under most LEDs are less hardy and need everything to be more perfect with less margin for error to thrive, but none of this is impossible. Most softies do not really seem to care about lights.

For the quick guide, make sure that the whites are fairly low - the waves that they give off have some harsh peaks that can harm coral that are not healthy enough to fight it off. This is not a "too much" thing (intensity), but a "wrong kind" thing. I would keep these under 20%.

If you are really unsure of the LED, just go and get a cheap hydroponics 4 bulb T4 and put some cheap GE 6500K bulbs in it. If the coral perks up, then get bluer bulbs and make a better unit. 6500K is a great spectrum for coral.


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Old 02/04/2018, 03:41 PM   #5
cdearing
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How do I add more photos. I meant to add a screenshot of my lighting schedule.
I typically do a 5 gallon water change every weekend.
I will reduce the whites and see what happens.
Also will post more parameters once I get a chance.
Thank you all for your comments.


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Old 02/06/2018, 02:39 PM   #6
YetiCrab
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Quote:
Originally Posted by cdearing View Post
I didn't have a spare light so put a large plant growing light fixture over the tank for about 5 days while I waited for my new lights on the slow boat..... Also the sand has a weird texture like reddish hard layer over the top.

Sounds like the grow light fueled a bacterial or cyano outbreak. It would have been better to lights out for 5 days, than place a grow light (just my opinion.)

I would lights out for minimum 3 days, and slowly ramp them up over 2 weeks. Give your corals a chance to recover and allow your water column to resolve your bacterial issues.


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Old 02/07/2018, 10:35 AM   #7
cdearing
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[IMG]http://[IMG]http://i63.*******.com/4ieewx.jpg[/IMG][/IMG]
Trying to upload my lighting schedule.


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Old 02/07/2018, 01:35 PM   #8
cdearing
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UV 44%
Violet 76%
Royal 81%
Blue 77%
Green 10%
Deep Red 10%
Sunrise 7:50 AM
Sunset 5:00 PM
3 hour Ramp

Nitrates 2 ppm
Phosphates .02 ppm

I honestly don't if these tests are correct. I will try testing again this weekend to see if it comes out the same. Seems high for nitrates. I do regular water changes. Have clean low tds rodi water. Only 2 fish. No overfeeding now that I don't have any anthias. Macro algae in my 30 gallon sump. Decent clean up crew.


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Old 02/09/2018, 01:04 PM   #9
cdearing
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Any comments on the lighting? I don't think my hammer has much time left. Maybe I need to take a saw to it and put it in someone else tank? I am slowing reducing white light.


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Old 02/10/2018, 12:00 AM   #10
DesertReefT4r
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2 no3 and .02 is not high, in fact jts a pretry decent level to maintain could even come up just a hair. I would say yes the extended lackmof light then blasting then with light then changing lights did had an effect on the corals. Dim the lights way down and given them a month then slowly increase the lighting every week.


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