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Old 04-16-2010, 11:21 PM   #1
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Does one lead to the other?

Just had the diatoms start to decline after about a week. After doing an inspection around the tank, I seen that pink dust stuff starting to grow(a few small patches on the sand and 1 spot in the sand touching the glass.) The tank is a 180g with a 75g sump and 2 24x14x20 wet/dry filters used as fuges. I have 230lbs of live rock, about 40 of that is rubble in the sump. The fuges both have chaetomorpha in them. I had this happen when I had the sump as my main tank, took it down and dried it out as well as the rock I had in there. Is there some sort of connection between diatoms and this pink dust stuff(cyanobacteria is what I'm thinkin it is.)

I kept the lights off during the cycle, done a 100g water change when the cycle finished and have had the chaeto in place for about a week.

The params are ammo 0, nitrite 0, nitrate 0, phos 0, calc 450, dkh 9

I would take a pic but I haven't gotten another camera yet.
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Old 04-16-2010, 11:24 PM   #2
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It sounds like Cyanobacteria. Just because your Nitrate and Phosphate is zero doesn't mean it can't grow, because it can be using those making the readings zero.
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Old 04-16-2010, 11:25 PM   #3
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I`m thinking your PEC will help alot. Excessive nutrients are a big cause and you wiped alot of them out with that. We have a good article on cyano in our SW articles section.
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Old 04-16-2010, 11:26 PM   #4
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PEC?
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Old 04-16-2010, 11:29 PM   #5
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If i'm not mistaken, i think he means PWC. Not sure though.. but the W key is pretty close to E key.
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Old 04-16-2010, 11:31 PM   #6
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Fat finger syndrome. Yes I meant PWC.
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Old 04-16-2010, 11:31 PM   #7
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Ah yeah. I see it now.
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Old 04-17-2010, 02:21 AM   #8
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I done the 100g change after the cycle. Right now I'm doing 40g a week. I kinda hoped that the large amount of chaeto would kinda keep the phosphate and nitrate under control. The main header drains into the fuges first and then overflows to the sump. I check the sock every day and feed every other day. I have a firefish, McCosker's wrasse, a blue and powder brown tang,2 ocellaris clowns, 3 skunk shrimp, and about 80 snails and 1 hermit(the fish store threw him in by accident). That's all the fish I plan on having and I wouldn't think they would overload the filtration setup I have.

What's weird is this pink stuff only shows up after the diatoms die off. If I only cut the lights on 2 hrs every other day to feed it disappears. Then after about a month of that, it started reappearing but never got any worse, I mean the patches never got any bigger than 3 or 4 inches and never took sheet form. That's what happened in the 75 I am using for the sump now.
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Old 04-17-2010, 04:23 AM   #9
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What kind of water are you using for PWC and topoff?
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Old 04-17-2010, 07:02 PM   #10
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I use ro/di for both. I want to ask, the lady at the pet store said it sounded to her like red diatoms since it is like dust. She said cyano starts out as a slimy mass, not big or anything but that it does not start out like dust. This has me baffled to say the least.
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