Discus suddenly acting sick-Help

[dpboyer]

Problem

1. Please explain the problems with your fish. When did you notice the problems and did anything unusual happen that you think started them?
My largest discus (silver dollar size, was dime size when I got them) was fine last night when I fed the tank and did water change. This afternoon I noticed him swimming sideways on the bottom of the tank; when he would swim up in the water column he would keep making left hand turns (never turned right)... every so often he will dart suddenly from one side of the tank to the other (almost faster than I can see), but he is spending most of his time laying on his side on the bottom.
All the other fish are doing just fine (and they all get along with each other.)

2. Symptoms (i.e. turning dark, excess slime, not eating, clamped fins, flashing, darting, clamped gills, white/yellow/green poop, hiding, headstanding or tailstanding, white on tips of fins, rotting or fungus, blisters/white zits on fish, bloated, cloudy eyes, wounds).
laying on side on bottom of tank and swimming in circles.

3. What medications/ treatments have you already tried and what were the results. Include dosage and duration of treatment.
none


Tank/Water

4. Tank size and ages, numbers and sizes of fish.
40g breeder bare bottom
He shares the tank with 2 siblings (3-4 months old), 7 angels (who were nickle size a month ago and now getting to be very large...), 5 pygmy cories, 1 female betta, 2 assassin snails, and some pond snails.

5. Water change regime (What percentage and how often).
25% daily (I siphon the bottom every other day)

6. How long has tank been running? Is it bare bottom? If you have substrate, what type and how deep is it?
2 months, bare bottom

7. Do you age your water? If you do for how long and what is the ph swing.
yes...24 hours... don't check for ph swing

8. Parameters and water source;

Note: Water Parameters are important in diagnosing problems within a tank. If you don't own test kits for the following information, you can purchase them, test your parameters and post this info as soon as possible.


- temp _81F

- ph _ 6.6

- ammonia reading _ 0

- nitrite reading __ 0

- nitrate reading _ 0
What type of water or combinations of water sources do you use? If it is an RO/tap/well water mix, please list percentages in the mix.

- well water ____

- municipal water 100% (aged for 24 hours with prime in an empty heated tank)

- RO water ____


9. Any new fish, plants or inverts added recently.
no

10. Include any pictures or videos you have which shows the symptoms. If you can't add them to this post, please provide a link to them.

video of the Discus from tonight is here: http://youtu.be/Elzf08vyyUM

[Second Hand Pat]

[nc0gnet0]

Honestly, I am sorry but I think it is to late for this guy. I would really like to see you give it a go with nothing but discus in the tank and 50% daily water changes.

[dpboyer]

The discus did not survive the night... I am just hoping that none of my other discus experience the same problem.