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Old 04-13-2014, 06:41 AM   #1
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Brown algae covering tank

Hi I've started to get brown algae on my live rock since I've upgraded to LEDs and getting to the point off covering all the rock work. Tanks an 80 gal with 45kgs off rock with two clowns and clown goby,1 cardinal and a royal gramma. Also use ro water and been running for nealy 18 months.

Before this was getting everything ready for corals why the LEDs upgrade. I always test water twice aweek and most of test are good apart from kh sits at 8, nitrates at 10ppm and phosphates were at 0 till I got a hanna checker and found them to be .15 so done some big wc and got a reactor to help keep them down plus cut back to only feed every other day and now phosphates are .04 but the algae still growing after doing wc so what else can I do to get rid off it for good as want some coral when I can sort it out. Thanks for any info.
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Old 04-13-2014, 08:58 AM   #2
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I had the same problem. If you got dimmable lights turn them down, if not shorten the time that you have them running. Brush the algae off the rock and then do your water changes. It will go eventually.
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Old 04-13-2014, 09:44 AM   #3
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The brown is diatoms. A normal part of your tank settling in. This should give way to good green algae.
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Old 04-13-2014, 10:25 AM   #4
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Keep a check on your nitrate, phosphate and silicate levels and reduce as necessary. Diatomous algae need silica with which to produce their protective outer 'shell, known as the frustule. Once silicates are used up or removed, the brown algae should start to diminish.
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Old 04-13-2014, 01:20 PM   #5
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Quote:
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The brown is diatoms. A normal part of your tank settling in. This should give way to good green algae.

Good green algae? Sounds more like coraline which diatoms aren't associated with.
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Old 04-13-2014, 01:35 PM   #6
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Hi thanks for info but tanks been up for 18 months.it looks more slime algae but brown.
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Old 04-13-2014, 01:41 PM   #7
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Hi thanks for info but tanks been up for 18 months.it looks more slime algae but brown.

Pictures would help.
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Old 04-13-2014, 01:50 PM   #8
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Old 04-13-2014, 01:56 PM   #9
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Looks like nuisance diatom to me.
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Old 04-13-2014, 02:03 PM   #10
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Looks like nuisance diatom to me.

It looks like it on pics from google so what's best to get rid of it. Thought was only new tanks get diatom algae but looks like I'm wrong lol
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