Carbon source for denitrifying bacteria

[Randy Holmes-Farley]

It was years ago, and I am having a hard time distinguishing the effects of sugar, and the effects of iodate addition, that was not near in time to the sugar, but also caused some color changes. IIRC, tan polyps darkened substantially, and one other type of coral darkened (browned), but I do not recall which species.

 

[Navyblue]

Another observation from my previous dosing and I also started to see it now, is that I have this mucus like strand on the glass.

I have another question, can bacteria be skimmed out?

 

[Randy Holmes-Farley]

Some bacteria will be skimmed out. Many will be attached to surfaces and will stay in the tank.

The mucus strand may actually be bacterial colonies.

 

[Bomber]

I'm having coffee. How about you guys?

But while I'm trying to get more than one synapse to fire at a time, I'm thinking about this.

You're adding a nutrient to reduce other nutrients in the hopes that feeding one nutrient will cause the uptake of the other nutrients. In effect causing the nutrients that you're trying to get rid of to become limiting.

Why not just eliminate the source of the first two nutrients?

 

[Randy Holmes-Farley]

I'm having coffee. How about you guys?

I'm having Diet Pepsi.

[Why not just eliminate the source of the first two nutrients?

Wait. Don't tell me. Let me guess. Sand beds? :lol:

 

[Habib]

Why not just eliminate the source of the first two nutrients?


If posible and if it would not have a negative effect then that might be the best way.
However, if the increasse in P and N is because C is limited then I see no problems in adding C.

 

[Bomber]

Wait. Don't tell me. Let me guess. Sand beds? :lol:

Noooo Mr. Pepsi LOL

You can keep sand beds clean too.

However, if the increasse in P and N is because C is limited then I see no problems in adding C.

That's the one I'm having a problem with Hab - good evening to you

 

[Navyblue]

How can we explain the increase in skimmate production?

 

[Randy Holmes-Farley]

How can we explain the increase in skimmate production?

Bacterial waste products and secretions seems likely to me. I also think that is why ozone impacts skimming: bacteria consume the organics that have become more bioavailable, and then in turn release organics to the water.

 

[Habib]

How can we explain the increase in skimmate production?

Waterborne bacteria.

 

[Habib]

That's the one I'm having a problem with Hab - good evening to you

Still afternoon here. Good morning to you.

Why do you have a problem with it?

Would you have problem if the food you would add would have a higher C:N and C ratios?

Or a lower N:C and P:C ratios (checking how your coffee is working ) ?

 

[Navyblue]

It's close to midnight here and I'm sipping my cold chocolate milk

So did the carbon dosing enables more efficient nutirent export through skimmer? or is it I am just skimming out what I have dosed?

 

[Bomber]

No but those things are balanced. Adding one in much higher ratios skews it artifically.
Like adding a lot of P to make N and C limiting. What happens when that artificailly added P crashes?
Then you have a abundance of P released and no where for it to go.

(coffee is not working yet. Yesterday was the first Monday of the month meeting - translated - Let's blind side the boss with a bunch of stuff we should have told him weeks ago.)

 

[Randy Holmes-Farley]

or is it I am just skimming out what I have dosed?

None of acetate/ethanol/sucrose will be directly skimmed out in significant quantities. So if you are getting more organics in the skimmate than before the carbon additions, then they are other organic materials. As such, they almost certainly contain some N and P, so it would be my opinion that you are not just skiming out what you added.

 

[Bomber]

From my earlier dosing I get a bacteria bloom from overdosing. And it is also noted in the German website of dosing vodka.

This you can skim out.

 

[Navyblue]

Will excess C cause more harm than excess N or P?

 

[Bomber]

Good question.

Since N and P are in many different forms and the C you're adding is in a simple form, I say definitely yes.

 

[Navyblue]

Can you explain why does simpler stuffs causes more harm?

 

[Bomber]

Rate of exchange.

If N and P are compounded you will not get a spike from them, you'll get a slow conversion and uptake.

The C you're adding is in a simple form that will cause a spike.

 

[Habib]

If N and P are compounded

If

But the concern is that not all is "compounded" but can present in the water colum as ions. This is what hobbyists measure.

If adding a simple carbon results in reduction of N and P then the water was limited with respect to carbon.

This justifies the addition of a simple carbon source.


The C you're adding is in a simple form that will cause a spike.


What kind of problems would that cause?