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what is wrong?
I need some help with my Crypts. I have a 29 gallon aquarium with Amazon
Swords, Crypts and Crispus. My Crypts are slowly dying and I can't figure
out why. They are developing brown spots that originate from the base of the
leaves (at the tuber) which eventually spread throughout the leaves and kill
the plant. I make a 10% water change with deionized water every week. I
condition the deionized water with electroright and raise it's pH to 6.5. The
pH of the deionized water is below 6.0 if I leave it alone. The following is
a list of my water parameters and other conditions:
Lighting - 2 20 watt bulbs with a 12 hour photoperiod
CO2 - yeast method. I don't test the CO2 content of the water at this time.
the yeast mixture every 2 weeks.
Ammonia - 0
nitrite - 0
nitrate - really don't know. I have not tested it for quite some time
phosphate - unmeasurable
KH - 2-3
GH - 5 to 6
temp - 78
iron - .01 to .02 I use Duplarite G in the substrate and suppliment with
suppliment every two weeks.
Could my problem be from the low KH or possibly something to do with the
nitrate which I have not tested? Everything has been fine for about 1 1/2
years and this all of a sudden happens. I did have pH problem a month or two
ago but that has been resolved. The other plants are doing fine. Any help
would be greatly appreciated.