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Posted by Mike Wood on March 28, 2006, 9:40 am
Please log in for more thread options rsleet@cafonline.org (Roger Sleet) wrote:
> (Mike Wood) wrote:
>
> > *Date:* Sun, 26 Mar 2006 10:40:02 GMT
> >
> > I'm migrating an old tank that currently uses an undergravel filter to
> > an external filter. I've had the two running in parallel for about 6
> > weeks now and am planning to switch off the undergravel filter shortly.
> >
> > Is leaving the old plate under the gravel likely to cause any problems?
> > I imagine the water in the gap won't circulate much and so could get
> > anaerobic.
>
> I've not had problems. Yes the space will become anaerobic, as will the
> lower regions of the gravel if it is the sort of depth you should be using
> on UG. Might form quite a useful de-nitrification area.
>
> If you are worried then leave the UG uplift in place and syphon at least
> some of the water out that way when you do your water change. That will
> at least prevent the build up of anything nasty.
>
> Roger Sleet
> Roger's Aquatic Pages http://www.sleet.plus.com
Thank's for that, I hadn't thought about using the uplift. I was going
to take it out, but it's quite well hidden, so I'll leave it in use it
for some of the water change.
Mike.
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>
> I'm migrating an old tank that currently uses an undergravel filter to
> an external filter. I've had the two running in parallel for about 6
> weeks now and am planning to switch off the undergravel filter shortly.
>
> Is leaving the old plate under the gravel likely to cause any problems?
> I imagine the water in the gap won't circulate much and so could get
> anaerobic.