What discolorize white sand? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 07-06-2010, 01:42 AM Thread Starter
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What discolorize white sand?

I have white sand in a low light 20g that I set up about 6 months ago. I'm running an Eheim 2236 and an AC50, so the flow is strong. Now lots of sand grains have a yellowish tint. I'm not sure the discolorization is caused by diatoms because 10 Amano shrimps in the tank eat them in no time. What discolorizes the white sand?
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post #2 of 5 (permalink) Old 07-06-2010, 01:47 AM
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Just a guess, Bacteria?


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post #3 of 5 (permalink) Old 07-06-2010, 01:55 AM
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Algae, bacteria, poop, uneaten food...

It's the reason personally I can't stand white substrates, you have to constantly work to keep them looking clean.





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post #4 of 5 (permalink) Old 07-06-2010, 04:12 AM
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Diatoms, mulm, waste, bacteria, all sorts of stuff (the shrimp do eat the diatoms, yes, but they can't possibly eat every single diatom on every last grain of sand) - all things which are, in moderation, important to the biological stability of an aquarium. Pure white sand is dead sand. You may not like the yellowing look nearly as much from an aesthetic perspective, but it's healthier for the things living in and around it.

But, I'm with Laura Lee on this one - white substrates are a PITA to deal with in the first place and I don't personally think it's worth the effort. Brown, tan, red, and black ones are all much easier to keep looking good.
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post #5 of 5 (permalink) Old 07-06-2010, 04:16 AM Thread Starter
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I'm seriously thinking about replacing it with TMS.
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