Polylactic Acid in shrimp tank filters?? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 12-08-2013, 12:10 AM Thread Starter
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Question Polylactic Acid in shrimp tank filters??

Greetings to all, I've been browsing some shrimp forums and came across a very interesting post claiming polylactic acid and some other biodegradable plastic can be used in a shrimp tank filter.. Any shrimpers here have experience with this?

The post first claims ...
"The main reason why periodic water changes are required for some tanks is because of the production of nitrate, and only denitrification microbes can process nitrates, but denitrification microbes in aquariums are mostly anaerobic, which is why nitrates are particularly difficult to get rid of in a tank; For these anaerobic microbes to successfully decompose nitrate, they need a source of carbon, which is where polylactic acid comes in."

The post also claims "other than polylactic acid, polybutylene succinate, polyhydroxyalkanoates, polycaprolactone can also be used for the same purpose. For anaerobic microbes to successfully live, multiple filters need to be connected in a sequence so that nitrifying bacterias can use as much of the oxygen in water as possible, and the biodegradable plastic should be placed in the last filter of this sequence. If this is accomplished, the need to change water is eliminated completely."

Original post: http://bbs.tropica.cn/thread-863303-1-1.html

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post #2 of 4 (permalink) Old 12-08-2013, 05:08 AM
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Nothing terribly new. There's already commercial plastic pellets for this, like NP-Active Pearls. And long before that, folks were using cheap vodka as the carbon source.

But if you use nitrates to grow lots of bacteria, then you have to remove them with a protein skimmer or frequent filter cleaning.

If allowed to remain in the tank until they die, they release ammonia. Which will be converted back to nitrate by other bacteria. And nothing will be gained.

Plus remember water changes remove all buildups, not just nitrate.
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post #3 of 4 (permalink) Old 12-08-2013, 05:48 AM Thread Starter
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Quote:
Originally Posted by DarkCobra View Post
Nothing terribly new. There's already commercial plastic pellets for this, like NP-Active Pearls. And long before that, folks were using cheap vodka as the carbon source.

But if you use nitrates to grow lots of bacteria, then you have to remove them with a protein skimmer or frequent filter cleaning.

If allowed to remain in the tank until they die, they release ammonia. Which will be converted back to nitrate by other bacteria. And nothing will be gained.

Plus remember water changes remove all buildups, not just nitrate.
That is very informative

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post #4 of 4 (permalink) Old 12-08-2013, 06:32 AM
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From what I've been reading, heavy planting can eliminate your nitrates. Plants love them. I'd imagine if you had a really heavy bioload or your tank hasn't established bacteria in the substrate. The nitrate-eating bacteria need anaerobic conditions though, and I don't know that any part of a traditional filter system can support that.
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