No further fish loss. I have decided the loss of 4 discus in one day with the others gasping for air at the top of the water line was obviously secondary to low oxygen levels that happended at night. It was clearly not disease as the fish were not sick. The other fish responded nicely to the addition of the air bar. No further problems of any sort. I think it is the heavily planted tank using up Oxygen at night plus the additional fish that caused the problem. Wow! I didn't expect that. I have read a fair amount but did not read about losing fish to low oxygen in a well-maintained tank. I had just changed 45% of the water the day before the fish died. I distinctly remember adding the Prime to be sure that the chloramines were not a problem.
I changed the water again tonight. I am using the air bar from 7pm until 10am in the morning. If everything goes OK I will buy 3 more discus from Pet Innovations locally. The have 3 good-looking fish. These will add the blue that I am missing.
I have been pleased with the albino discus. They are striking! They really stand out in the aquarium.
The plants re looking great and filling in faster than I expected. It is the best looking planted tank that I have seen in person. Obviously there are better looking planted tanks, but I have not seen them personally.
I have checked NH3, NO-, Nitrates....all 0. PH has been consistent as has temp. I added ferts today.
