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Old 02-19-2008, 09:06 PM   #1
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orange-rust color on base rock

I have a 75 gallon saltwater tank that is 6 weeks old just starting . cycled my tank for 1 month before added 3 blue chromis 10 blue leg hermit and 10 snails and now have this orange rust color on my base rock inside of tank walls on my sand i have never used tap water i have a r.o. in my house i have tested my r.o. and its below 10 ppm new filters and all i have done saltwater before and not seen this my levels are all fine let me know if you know so i can learn more

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Old 02-19-2008, 09:26 PM   #2
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Sounds like a diatom bloom . Common for new tanks ,while the biological levels start to grow and level off .. It is normal and will go away on its own , to help it along you can do your water changes of 10%-25% weekly and usually it will decline in a couple to few weeks ... It will respond to the nutrient levels in your water it is normal

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Old 02-20-2008, 09:32 PM   #3
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I agree that it does sound like diatom.
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Old 02-21-2008, 12:49 PM   #4
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Agreed, it will burn out shortly.
Age is relative, you are only as old as you act....of course, this works in reverse....

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Old 02-21-2008, 07:33 PM   #5
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I agree. The brown rust colored stuff is typically diatom blooms. One thing that I have learned over the years is don't stir it up, and let it die on its own. I agree that water changes will help reduce diatoms as well. Make sure water flow is as strong as it needs to be (75x10=750gph). HTH


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base, base rock, color, rock

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