<a href=showthread.php?s=&postid=12730382#post12730382 target=_blank>Originally posted</a> by Zedar
At this time there is still a lot of questions to be answered about this method. The long term success I believe has been shown. But the exact science behind it is still not.
At its core the vodka method is simply supplying ORGANIC carbon to feed bacteria. In the sandbed and live rock denitrifying bacteria reduce nitrate to nitrogen gas. Carbon allows them to do this more effectively. N03 removal.
Free floating bacteria (heterotrophic) also take advantage of this carbon and consume it along with proteins, trace elements, P04 etc.
(This is the reason Zeo users dose K+ iron Iodide etc. to replenish what the bacteria remove.)
With a strong skimmer these bacteria are skimmed out and the P04 and other food stuff is exported with them. P04 removal
Think of it like algae in a refugium. Each time you remove excess macro algae your exporting the P04 N03 with it. This is the same concept only much more efficient.
But unlike algae which gives off oxygen, these bacteria (heterotrophic) consume oxygen, and if gone unchecked can suffocate the tank. So thats the downside. And hence the reason for a good skimmer. The quicker the skimmer removes these bacteria the better.
Zeovit, fauna marin etc use the same concept. But they replace the DSB with a reactor filled with zeolite. It's a more aggressive method.
I think thats a simple explanation. Please feel free to add/correct
- what questions do you have? I think what remains is good vs bad bacteria, carbon dosing promotes both. I haven't heard of anyone having any disease issues. But since there are bacteria living on corals themselves, how are the corals impacted by this? What other organisms growth rates are increased by carbon dosing (some report some algae growth).
- long-term... hmmmm... I think the British economist Lord Keynes said it best "... in the long term we're all dead". It seems that many aquarists have a tank up for a few years and then upgrades/downgrades/gets out of the hobby. I think they can be successful with C dosing...
- so then are the bacteria C limited since they are not doing this otherwise... with all the C in the alkalinity system, this may not be the case ( I believe this was EB's commentary).
- why are they free floating bacteria? Is the snot some users report, not attached to some substrate/pumps etc?!? Are they not, or potentially some chemotrophes?
- there is no evidence that bacteria utilize iodine that I've found, if you have some please let me know...
- IMHO Zeovit and the other systems, are different and shouldn't be considered anything but different. ZEO provides the reactor as a means of cultivating bacteria guilds in itself and not the tank. Sure there is a source of carbon, but there are other environmental benefits such as a source of strains to be cultivated, a unique substrate, and decreased flow, etc...
Good post zedar... more to come...