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Old 01-20-2015, 12:34 PM   #1
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Still got diatoms!!!!

Hi everyone. I still have a diatom problem. It just will not die down!

Any idears? I thought it might be that my lights are extremely overpowered? But I'll tell you some background info so you can try and piece together why the problem is still going on.

It's a 630litre system. It has correct params.
0 ammonia
0 nitrite
0nitrate
0 phosphate
420 calcium
1250 magnesium
10 alkalinity
0.24 salinity

I have all dried rock except 5kg of live rock. And live deep sand bed. I have a filter sock, filter wool, 800litre v2 skimmer. The only thing I don't have is carbon but will be getting some soon. Also got a deep sand bed refugium with Cato morpha. In the tank I have a chromis and Duncan coral with clean up crew. I am not over feeding I am literally putting one mouthful of food either brine shrimp, pellet, Mysis in a day. So I personally have no idear why I have so much diatom?

Please help still have a moorish idol waiting for me in the shop. It's so painful going in there and seeing him but knowing my tank isn't ready yet😭 Any comments appreciated.


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Old 01-20-2015, 12:54 PM   #2
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How about a picture?
Diatoms will die off when the silicates are consumed from the sandbed and not a big deal.
Cyanobacteria on the other hand would point out nitrate and phosphates in the water column. If enough, would give you false readings of 0.
So, is there anything living in the tank? Once the cycle is done, the bacteria still need an ammonia source to survive. Want to make sure your waiting fish doesn't have to wait longer and don't recall if there was anything in there to do such.


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Old 01-20-2015, 12:57 PM   #3
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I'd go back and edit but my phone is acting up. There is no way there is 0 nitrates in the tank with that much feeding. I want to see a picture as I suspect this is cyano and not diatoms.


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Old 01-20-2015, 01:10 PM   #4
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With 2 DSBs you'll have a lot of silicates for the diatoms to feed on. More sand = more diatoms


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Old 01-20-2015, 01:16 PM   #5
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Click image for larger version

Name:	ImageUploadedByAquarium Advice1421774165.331332.jpg
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ID:	261676 Here's a pic. Thanks for the replies so far I might try and test silicate if that's possible?


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Old 01-20-2015, 01:20 PM   #6
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Well, like I suspected that isn't diatoms and is Cyanobacteria.


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Old 01-20-2015, 01:22 PM   #7
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Ok well is there a solution?


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Old 01-20-2015, 01:24 PM   #8
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Reduce nutrient import, increase nutrient export. And more flow usually helps with cyano too, but it's the nutrient issue that really needs to be addressed


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Old 01-20-2015, 01:25 PM   #9
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So how is nutrients being put in the tank? When all food fed is eaten.


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Old 01-20-2015, 01:29 PM   #10
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Wether it's eaten or not it's still adding nutrients (fish do poop ). How are you rinsing your frozen? I only feed 2-3x a week, every 3 days or so.


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