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Plant substrate mystery
APDers,
Need help here. I have an aquarium friend with a peculiar problem. After a
20% water change has been done on two of her tanks with plants, everything
dies. The water changes are every two weeks and the gravel is vaccumed in
the process. Here are the details:
120g/40g (breeder)
white silica sand substrate, 1 inch thick
low current/filtration
shell dwellers and other cichlids
plants
12/24 hours after sand vaccum
the fish are seen at the surface gasping for air (possible O2 depletion)
bloom
surface scum/film
pH 7.6
Amm/Nitrite 0
Nitrate 20ppm
no chloramines
What causes the fish to die?
Several possibilities:
Activation of dormant, good bacteria that remove all of the O2
Anaerobic bacteria are stirred up and deplete the O2 somehow (not
sure about how this would work)
Phosphates (level not known) somehow fit in the picture
HELP!
Thanks in advance.
=======================================================
Matthew T. Mason "The young do not know
Doctoral Student enough to be prudent,
Department of Molecular Genetics and therefore they attempt
The Ohio State University the impossible -- and
mason.163 at osu_edu achieve it, generation
after generation."
-- Pearl S. Buck