10-21-2009, 03:57 AM
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I am thinking the problem could be trying to keep livebearers in soft water. Some time ago another member suggested adding crushed coral to your filter area to raise the 6.6 ph you posted to a more alkaline 7.4. Live bearers,, such as mollys and platys simply don't do well in water with ph values less than 7.4 in the long term and finrot,fungus,and possible ICH could all be related to improper water conditions for the fish to thrive in. A cup ,or perhaps a half cup of coral chips, found at fish stores and often sold as saltwater substrate will increase the alkalinity to a more favorable degree for the fish you are keeping. And I also agree with another member who suggested using water from outside spigot, or faucet, IF your water that you use in the aquarium is going through any kind of water softener.
As Lupin said,finrot,and fungus are often signs of unfavorable water conditions and until water conditions are improved,,the fish will continue to be affected and medications will have little effect.
There is a cheap formula for hardening the water that is used by some for keeping fish who need alkaline water and perhaps it might interest you.
One Teaspoon baking soda( Sodium Bicarbonate)
One Tablespoon Epsom salt (magnesium sulfate)
One teaspoon marine salt (sodium chloride and trace minerals)
This formula is per ten gal of water. Best to mix it in rubbermaid tub and circulate the water for an hour or two. Then check the pH and if it is suitable, not too alkaline (hard) then slowly add this water over the course of a week with small water changes every couple days.
If none of this appeals to you,, then I suggest keeping fish that appreciate the soft acidic conditions that you posted in earlier thread.
Assuming (always a bad thing) that your water test zero for ammonia and nitrites ,and nitrAtes are kept at low levels through weekly water changes of 25 percent ,,it is the acidic conditions (low pH) that is contributing to the problems you are having.