55 gallon planted tank progress( for those who care) - Page 7 - Tropical Fish Keeping - Aquarium fish care and resources
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post #61 of 174 Old 03-22-2012, 11:54 PM
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crystalline silica which is found is some playsand
Most all sand is crystalline silica (SiO2) - quartz - it would not be the same silica that would lead to diatoms as it is nearly insoluble in water at low temps and therefore not available to the diatoms. I believe this is also why it can cause health problems, if it is inhaled as a very fine dust it can lodge in the lungs and just stay there. It is the more soluble forms of silica (amorphous) that result in diatom growth.
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post #62 of 174 Old 03-23-2012, 12:05 AM
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I don't see anything on the MSDS that says it is anything other than quartz, meaning it is essentially inert, just don't mix it with hydrofluoric acid or pulverize and snort it
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post #63 of 174 Old 03-23-2012, 12:35 AM
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Originally Posted by Quantum View Post
Most all sand is crystalline silica (SiO2) - quartz - it would not be the same silica that would lead to diatoms as it is nearly insoluble in water at low temps and therefore not available to the diatoms. I believe this is also why it can cause health problems, if it is inhaled as a very fine dust it can lodge in the lungs and just stay there. It is the more soluble forms of silica (amorphous) that result in diatom growth.
I have read different but okay. I will leave it at this as it is getting off subject.
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post #64 of 174 Old 03-23-2012, 08:22 AM
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MSDS for Quikcrete playsand: http://www.quikrete.com/PDFs/MSDS-B4-Playsand.pdf

Pertinent info: component - crystalline silica (quartz), percentage (by wt) - 99.0-99.9; solubility in water - slight; stability - crystalline silica (quartz) is stable; data and precautions regarding inhalation

sand almost by definition is quartz which is a crystalline form of silica (SiO2), silicon is a very common element and is a component of many rocks and minerals, silica is just one of these minerals and quartz is just one form of silica
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post #65 of 174 Old 03-23-2012, 08:23 AM Thread Starter
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Great! Soo it's not my sand, maybe its just my tank running its course.

55 gallon planted tank, starting over!!!( looking crappy, needs a major rescape)
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post #66 of 174 Old 03-23-2012, 08:49 AM
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You know, this brings up an interesting question. I was curious since I used Quikrete play sand, and I know Byron says that's what he uses too, and it also lists silica sand .... and limestone o.O

http://www.quikrete.com/PDFs/MSDS-B4-Playsand.pdf

Now I'm questioning what to use in my 125g I'm setting up in a couple weeks.

EDIT: nvm, I see lots of people have commented in the time I was looking at it =p
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post #67 of 174 Old 03-23-2012, 10:57 AM
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I have four tanks with Quikrete Play Sand and the longest has been running for almost two years. None of these tanks have diatoms.

I tried this product because it came recommended by presumably knowledgeable members of a couple of my plant forums.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #68 of 174 Old 03-23-2012, 02:26 PM
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Yeah I wouldn't buy a fish to "fix" the problem. Its usually never a good idea. I would just give it a little more time and see if it stops spreading. Are you still wiping it off to see if it stops coming back? Btw I have never been able to get mine Otos to eat algea waffers or have never seen them eat any. I just make sure to keep some green algae on the back glass.
It wasn't my intention to suggest he purchase the otos to control the algae, but in re-reading my post I realize that is how it looks. I was just relating that they cleared up the leftovers quite well. I only purchased them shortly after the diatoms had already come under control. I too am against purchasing a fish to try and "fix" an issue.
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post #69 of 174 Old 03-23-2012, 07:22 PM
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it came recommended by presumably knowledgeable members of a couple of my plant forums
I hope it didn't seem like I was suggesting otherwise. Play sand is a good choice because it is crystalline silica: it is mostly insoluble in water at low temps and pressures and is chemically stable. The only issue is the inhalation hazard, just follow the manufacturers recommendations.

Silica is relevant with regard to diatoms because the cell walls of these organisms are made of silica, but it must be in a form they can utilize (which I believe is silicic acid). Crystalline quartz will not be a source of this since it will not dissolve in any significant amount in water at the temps encountered in aquaria - other more soluble forms of silica can, crystalline quartz won't.
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post #70 of 174 Old 03-23-2012, 09:26 PM Thread Starter
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Ok guys, enough sand talk. If its not the problem then let's move on. Please :) But thanks for the information, its always good to learn more about things.

55 gallon planted tank, starting over!!!( looking crappy, needs a major rescape)
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