One blue diamond not eating, all others doing well. . .

[DiscusMark]

I introduced 7 new 3+-inch discus (from Discus Hans) to my 55 gallon tank two weeks ago. The have been doing very well--moving around the tank, curious, eating, bright colors. A bit jumpy, but I assume that's normal for new discus. For the last 3 days, however, one of the discus (the Blue Diamond) has stopped eating, and is acting a bit lethargically, though it does continue to school closely with the others. I can't say for sure, but it also might not be defecating. (Haven't seen it do so in the last few days.) It does not look any differently from the other fish--no spots, no bloat, etc. The water parameters should be fine: ph 7.4, low nitrates, no ammonia, no nitrite. Temp is at 84.

Any input will be appreciated--thanks in advance for your consideration.

Here's the questionnaire:

Please complete this questionnaire if your fish are sick (copy and paste). The more details you can provide, the better we are able to diagnose and help you treat your sick fish.

DISEASE QUESTIONNAIRE


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?

One Blue Diamond not eating. Possibly not defecating. Problem first noticed 3 days ago.

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).

See above.

3. What medications/ treatments have you already tried and what were the results. Include dosage and duration of treatment.

Tried light salt bath once. 10 mins at 3 tbsp per gallon.

Tank/Water

4. Tank size and ages, numbers and sizes of fish.

55 gallons - 8 rummynose, 6 cories, 3 amano shrimp (all in tank 2 months), 7 3-in discus (added two weeks ago)

5. Water change regime (What percentage and how often).

35% 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, pool filter sand, 1-inch deep

7. Do you age your water? If you do for how long and what is the ph swing.

Yes. High Ph out of tap (8.8), but goes into tank at 7.4 after aging.

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 __84___

- ph __7.4___

- ammonia reading _0___

- nitrite reading _0___

- nitrate reading __5-10__

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 __x__

- RO water ____


9. Any new fish, plants or inverts added recently.

See above.

10. Please tell us what you feed your fish and how often. This can be critical information for solving the problem so be as specific as you can.

Have eaten beefheart mix (2x daily), flakes (1x), tetra color granules (1x), frozen bloodworms (1x)

11. 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.

[Ryan925]

7 3" fish in a 55 plus other fish sand etc being fed five times a day, 35% wc every other day will lead you to big problems. I would definitely suggest more wcs