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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. :).
[snip]
> 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
5000K.
[snip]
> 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?
[snip]
> 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.
[snip]
> 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.
[snip]
> 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.
Ditto.
> 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.
[snip]
> 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.