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Old 03-17-2009, 10:35 PM   #1
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algae on substrate

i am getting a carpet looking algae with a red ish brown color, it is taking over my sand bed. any ideas?

40 gallons
over 1000gph
backpack skimmer
4 inches sand
50 lbs rock
190W light on 10 hours
few haermit crabs and snails, 3 shrip, 2 clownfish, birttle star

nitrate - 0
ph - 7.8
ammonia- 0
salinity - 1.027
temp - 78
alkalinty - 2.8 milli equilavent per liter
mag - 1200
calc - 500

i know my ph is low, for some reason i can not raise it. are these diatoms? i was thinking about getting some macro algae and a in take refugium. i was using tap water and was told not to unless treated, so i started buying the water. i will be getting an r/o.
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Old 03-17-2009, 10:44 PM   #2
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That's diatoms, so please cut your hours from 10 to probably like 6-7hours per day... the longer the hours, it's blooming faster and your snails can't clean it faster than it blooms.

Wait... purplish, sorry I misread... I might not be right... experts chime in please...sorry....
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Old 03-17-2009, 10:50 PM   #3
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i was thinking about cutting the light for 2 days and then shortening the time it is on. i added a picture in my first post to help. i guess you could say its a little more red-brown than purple..my mistake, i changed it above
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Old 03-17-2009, 11:05 PM   #4
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Diatoms are nothing to worry about, they will burn themselves out. They thrive off of silicates and light.
I would be more worred about the cyano (red) that looks like it might be taking a hold.
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Old 03-17-2009, 11:09 PM   #5
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it grows so fast that if i remove a dense part of it, it grows back just as thick in a few hours

i have a ro/di in the mail as we speak
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Old 03-18-2009, 04:38 PM   #6
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if its this cyano, how do you get rid of that?
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Old 03-18-2009, 06:09 PM   #7
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Additional PWCs, less light, more water flow to those areas, less feeding.
I feed every 2 days and sometimes every third day.
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Old 03-18-2009, 06:42 PM   #8
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It looks like the beginning of cyano to me. Read this

http://www.aquariumadvice.com/articl...ae-/Page1.html
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Old 03-18-2009, 10:25 PM   #9
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I'm fairly new to saltwater and I was pretty much farming the stuff. I got some red leg hermits and some astrea snails - they're mowing through the stuff like it's candy.
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