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high nitrates
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oostern
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Joined: 23 Oct 2005
Location: new york

PostPosted: 2015.01.19(Mon)21:07    Post subject: high nitrates Reply with quote

My 10g planted lo-light tank is showing high nitrates.

NitrAtes - 40ppm+
pH - 7.0
ammonia - 0
temp - 75F
R/O water treated with Kent r/o right

8 celestial pearl danios (3-4 weeks in tank) - 2 showing clamped fins
tank has run 3-4 years
heavily planted, gravel substrate
misc small snails

Salvinia (outcompeted the frog bit), water sprite, java fern, small anubias
almost no algae

I'm concerned about the fish:
2 of the smaller danios are swimming with clamped fins. Seem to be eating, and schooling normally. One of the two hides more, especially when the dominant male is chasing everyone. He (?) also is the last to come out to feed, but he is not totally solitary. The other clamping one behaves pretty normally. It is possible these two are getting picked on/harassed more.
On the other hand the fish in general seem fine. Normal fishy behavior. Is there any way the clamping is behavioral and not physical stress?

History:
Danios introduced (successfully so far) 3+ weeks ago
mostly young fish
feeding spirulina crushed flakes 2x day
Tank had serious snail infestation, which has mysteriously abated past 2 weeks. Some snails remain.

Analysis:
several factors possibly contributing to high nitrates -
decaying plant matter? - salvinia on water surface has many leaves turning yellow/brown (past 2 weeks). But shouldn't they help take up the nitrates?
decaying animals? - snail infestation (<3mm ea) suddenly ended - I had been removing some live snails by hand, but the rest which 'disappeared' must have died
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10g low light planted: 8 celestial pearl danios
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oostern
Regulars


Joined: 23 Oct 2005
Location: new york

PostPosted: 2015.01.19(Mon)21:14    Post subject: Reply with quote

post continued...

analysis continued:
more dead matter - assassin snail which buried itself in the gravel 6 weeks ago and never reemerged.
gravel leaching nitrates (residual excess waste from snail infestation?)
uneaten food?

remediation plan:
30% water change every day til nitrates are stable at lower level
(have done this 2 days already. nitrates unchanged)
partial gravel vac each water change - top layer only not to disturb plant roots too much
reducing feeding to 1x day


thoughts anyone?
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10g low light planted: 8 celestial pearl danios


Last edited by oostern on 2015.01.19(Mon)21:34; edited 1 time in total
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oostern
Regulars


Joined: 23 Oct 2005
Location: new york

PostPosted: 2015.01.19(Mon)21:32    Post subject: Reply with quote


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10g low light planted: 8 celestial pearl danios
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krt
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Joined: 21 Nov 2006
Location: bedford, virginia

PostPosted: 2015.01.28(Wed)20:21    Post subject: Reply with quote

The simple answer could be old tank syndrome, otherwise my guess would be dead snails or too much gunk in the gravel.
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