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Re: pH & nightly airstones

Thanks, folks.  I was going to open this thread, anyway.

When T took the surface agitation (waterfall and airstone) out of the
new 40 gal iwht CO2, the pH became close to rock steady at 6.7ish, day
or night. The plants are growing well, alhtough it is totally beyond my
which of my tweaks caused THAT to happen.  I see some pearling during
the day.

So, I reintroduced the fish.  How can I tell if he is getting enough
02.  I hate to mess with a system that works by turning on air if I
don't have to.  THe fish is a bushynose plec, whose major activity in
the absence of other fish to harrass is to stick upside on a log and
breath, so I can't really monitor his activity level. Can I trust that
if he needs more oxygen he will go to the surface and gasp.  Or as seems
to be the habit of plecs, take a stroll out of the tank?


> What prompted me to add the airstone was
> the reaction my three medium sized discus were having after the first few
> days of C02 injection (gasping at the surface).  Since no fish appeared to
> be stressed in my 55 gallon tank, I added no airstone.  I will admit though,
> before implementing the nightly airstone regimen I noticed very little pH
> swing between the time the lights switched off, to when they switched back
> on in the morning.  If it wasn't for the stressed discus, I would have never
> added an airstone.
> The 65 gallon is monitored with a pinpoint pH monitor.  Since adding the
> airstone, I have noticed the pH go from 6.6 (at the end of the day) to about
> 6.8-6.9(just before the lights come on).  This small swing is completely
> acceptable to me considering the discus are no longer stressed in the
> morning.
> Michael Laflamme