Re: Nitrates & sludge problem
To: Aquatic-Plants at actwin_com
Subject: Re: Nitrates & sludge problem
From: stevensj at calshp_cals.wisc.edu
Date: Thu, 17 Aug 95 10:59:40 CDT
In-Reply-To: <199508170739.DAA12254 at looney_actwin.com>; from "Aquatic-Plants-Owner at actwin_com" at Aug 17, 95 3:39 am
Mailer: Elm [revision: 220.127.116.11]
> From: Stephen.Pushak at hcsd_hac.com
> Date: Wed, 16 Aug 95 13:05:48 PDT
> Subject: Re: Nitrate deficiency
> Joanne wrote:
> > I've been noticing that every time my nitrates get down to zero in my
> > planted tanks I get a yucky brown slimy sludge growing. I'd like to
> > know if anyone else has encountered this.
> These are diatoms I suspect. Odd however if you have plenty of light
> and catfish to stir up the bottom and good water circulation to keep
> detritus from accumulating too much on the bottom. Perhaps it is
> uneaten food and fish poop? I don't know if it is right to associate
> zero nitrates with this.
Well, actually these tanks don't have the greatest circulation. The
worst affected is my 25 gallon tank which only has two aquaclear 150
powerfilters on it & these keep getting clogged up with this slimey
sludge stuff. This tank does not have any catfish in it at the moment
but I keep intending to get some for it. The sludgey stuff grows on
plants (particularly near the base) and inside the filters a lot (in
the foam & inside the filter & intake tubes).
I'm pretty convinced it grows more when nitrates are zero - maybe it's
just a decomposition product from dying plants when nitrates get
limiting. The pH is 7.2, CO2 15-20 ppm (DIY sugar + yeast), GH 5, temp
82 deg F and lighting: 3 18" bulbs (1 coralife full spectrum, 1 coralife
50/50 and 1 vitalite).
I will just try keeping nitrates > 0 & see if that helps (& buy some
P.S. I will be gone all next week at a conference just in case people
try to contact me & can't.
P.P.S. I have been using a Tetra kit for KH & it just ran out. Anybody
got any suggestions for a different brand or stick with the same?