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Posted by JR
on 11/5/2009, 11:59 am, in reply to "Re: Good, better, best"
64.12.117.75
Good morning Steve!
Well I don't want to disappoint you but I'm about spent on this subject as I think I've shared all I can and I would only be repeating myself over and over again.
Please trust me on this one-- in all ornamental fish hobbies it is well understood that trapping waste leads to higher nitrAte levels ( especially in closed systems) than otherwise. This is why goldfish folks and reef keeps avoid deep gravel in their aquariums and also the reason WE avoid putting stones in the bottom of our ponds. In the marine fish hobby, open sumps have taken over the hobby and we see ehiems less and less today. It is just a basic reality in 2009, so you and Michael are out of step in this regard.
As for fines in circulation-- dilution of fines, slime, pollen, nitrATE etc are managed best with water changes or trickle. FF is next.
Trapped in a container under pressure, low pressure etc is a nitrAte sink. Free floating fines are diluted. Backwashing BBs is not unlike using a python gravel cleaner when doing water changes or disrupting gravel in omne of those rock bottom water gardens. It works only to a degree as the bacteria count returns and you can't get all the organic fines out unless you hit it conctantly * this is why some professionals recommend a back flush every seven hours.
A sump dump on the other hand tends to take out heavy water and a biweekly water change of 20% is really excellent for keeping water sparkling.
These are my observations after 25 years of koi keeping and in helping countless hobbyists over those years with their systems. As you know, I used to install systems in wholesale tropical fish facilities on the east coast and have found that certain universal principles are -- well--- universal. NOT all mind you. But in this case, closed trapping systems are always a source for excess nitrAte, no matter what the species kept.
Have a nice day, JR
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