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Old 09-10-2004, 02:16 AM   #1
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LR changing color

My live rock has changed from purple to almost white. What am I doing wrong?
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Old 09-10-2004, 07:26 AM   #2
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What has changed?

Also, post your test results.
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Old 09-10-2004, 10:53 AM   #3
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And your light source for the 20 gal hex

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Old 09-10-2004, 11:27 AM   #4
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...but it sounds like your coralline algae died, so you're seeing bare rock
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Old 09-11-2004, 12:36 AM   #5
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PH 8.4
NH3 0PPM
NO2 0PPM
NO3 5PPM


and I have a powerglow 30 watt florescent.
The surface of the rock lost most of its purple color
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Old 09-11-2004, 12:37 AM   #6
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how old is the tank
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Old 09-11-2004, 12:42 AM   #7
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almost a year old but no major problems
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Old 09-11-2004, 07:23 AM   #8
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Quote:
powerglow 30 watt florescent.
If this is the single bulb of no that came with the tank, then that is the problem. The purple corraline needs some more light.
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Old 09-11-2004, 08:38 AM   #9
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I think if everything was fine until now then most likely your bulb just needed changing. Old bulbs can definitely be a cause of bleaching.
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Old 09-11-2004, 10:52 AM   #10
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This noob didnt realize how important lighting quality is. Is there a simple way to measure light output?
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Old 09-11-2004, 11:23 AM   #11
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Also, do you have any urchins in your tank? They will also strip coraline algae from the rocks. Just a thought.
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Old 09-11-2004, 05:46 PM   #12
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your light output most of the time is based on the size of your ballest. For a tank that small, you should upgrade to NO lights and you will have a tremendous amt of growth...AND to improve the LR colors even more, add calcium too.. Im like you I didnt realize the importance of lighting.
Atari is right, the bulb(s) need to be changed. I had my NO flor lights for a year and my rock started fading too...I upgraded to VHO lighting and now I have purples all over the place!! But it does take time too!!
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