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[APD] RE: NH4/algae/FBF

>This also will use a corresponding large amount of O2 to accomplish
>this(these bacteria are oxidizers) and also need a large bacterial colony
>that is somehow fed and maintained(otherwise the bacterial levels will
>decline to match the available food resource).
>So this presents a huge problem for maintaining such a system. The other
>issue is that the NH4 is going to where first? In the tank or into the
>filter first? Who will have first dibs? Plants or bacteria in the filter?
>Some backup filtration is useful, and stabilizes tanks for this reason but
>more is not better. W/D's are better than FBF's IMO/IME. 

Well oxygen shouldn't be a problem as I have so much its pearling heavily after 7-8 hours of light.  Also, if I don't have lots of NH4 being produced.. I shouldn't be having a huge bacteria culture in the FBF either due to lack of food.  If I did see large oxygen usage (fish near the surface in the morning) then wouldn't that point to a  large amount of NH4 which would indicate that NH4 is a problem.
As for where the NH4 goes first, well since I don't have green water I would guess it has a good chance of going into the filter first as opposed to contacting the algae on a plant leaf or tank side.  More so when combined with algae removal pruning, it's not going to be 100% but I think any little bit would help. I already have an old FBF so it's a zero $ change, just the time to put it in.

Thanks James for your info also (didn't know only sharks create urea). Notice it's not quite in agreement with Toms ;) (with NH4, fish load and algae), why I love this hobby, it's as much art as science so you can do no end of playing around and discussing ideas.  Yes it does instantly get absorbed by algae and plants as I don't see any build-up, but as one theory goes it's the amount getting absorbed that causes the problem.  As I said it's no $, just 30 min work and it's something I'll try as a freebee experiment. Best experiment would be to remove 1/2 the fish but that's not an option.

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