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Re: [APD] aeration & a planted tank
Pearling is a sign of O2 saturation.
--- "Terry S." <tgs1 at rni_net> wrote:
> > However, even without CO2 injection, a heavily planted
> > aquarium can (mind you I say "can," not "always will")
> > more than adequate O2 at night with adding the bubbly.
> > fact, I haven't in my own limited experience seen an O2
> > shortage unless the electricity shutdown overnight and
> > pumps stopped. Which is why I've been curious about
> > set-up.
> Another 2 cents worth of observation on this... I have a
> 30 gal tank, very
> heavily planted, 55W CF, no CO2 supplement (but I do
> supplement C with
> Excel). Every time I do a large water change (usually
> with fertilization
> and Excel), the plants pearl madly for a couple days, and
> I can count on
> seeing the fish at the surface 'gasping' for oxygen in
> the mornings. One
> thing to note is that here in Phoenix, the water temp in
> the summer is often
> well over 80' F straight from the 'cold' water tap, and
> the tank usually
> runs around 80-82' F, or sometimes even higher.
> I'm guessing that the increase in temperature is
> contributing to the O2
> depletion since the water holds less at higher temps.
> After following this
> thread, I've decided to add some aeration at night to
> reduce the stress on
> the fish. It'll be interesting to see if the phenomenon
> goes away this
> winter when I can keep the tank at a lower temp.
> Terry S. in AZ
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> Aquatic-Plants at actwin_com
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