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Re:Re:Re: To much light

Onis Cogburn wrote:
> I still have some 
>   questions and hopefully you or other members of the list can answer them.

It's my policy to never answer a question completely. :).


> the bulbs I have purchased have all had a similar spectrum and fell into
> the 5000K group.

I think the problem (if there is one) is with lights substantially under 


> Option 1 would be the classic method of building a rich substrate.
> Maintenance would entail 
> replacing nutrients in the substrate as they are depleated but refraining
> from addint additional 
> nutrients to the water column.

OK.  Could be tough.  Anyone master this?

> The second approach would seem to be: If it is desirable to feed the plants
> daily and if the 
> substrate affects the utalization of the nutrients, this system should be
> based on a sterile 
> substrate.  Consistency of the material would be an issue but any organic
> nutrients would be left 
> out.

I think this is the optimum aquarium approach.  It works.

I can think of a third approach.  Build the substrate with raw materials 
that don't contain a lot of nutrients at the startup, but which can gain 
fertility as the substrate matures.


>  The only variations
> that I have 
>   observed that have affected the growth rate of the algae have been
> cutting the light by 1/2 
>   and filter status/water flow rate.  

I think you would have to run sans fertilizer for quite a while - say three 
weeks to a month - to expect a difference.

> I remain stumped.  I bought a big bunch of grass shrimp and added them to
> the tank.  If they 
> help great, if not they are a good snack for the fish.

I kept grass shrimp for a while.  Pretty good scavengers, but I wouldn't 
say they were much for eating algae.  Ghost shrimp aren't good algae 
eaters either, but they did a better job for me than did grass shrimp.

>  I would appreciate more comments on
> the hypothisis that 
> fertilization of the water column is contradictory to a fertalized substrate.

> I have been able to adjust all the measurable nutrient levels with the
> exception of the 
> phosphate.  Although not what can be considered high, I have never been
> able to drive it to 
> zero.

I'm very suspiscious of our hobby test kits at low concentrations.  
Especially the phosphate kits.  I have three nitrate kits that I 
occasionally cross compare just to confuse the issue.  They can't reach a 
consensus about whether its there or not.  


> I have never been able to 
> keep a system balanced by supplying all nutrients via the substrate so if
> this proves out, I guess 
> I am dead!  Many thanks to everyone.

Gee.  Kinda dramatic for an engineer! :).  It sounds like you might want
to look into a dupla-compliant setup.

Roger Miller
In Albuquerque - not as hot as Austin.