Tropical Fish Keeping - Aquarium fish care and resources

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KPainter 07-17-2012 03:42 PM

What to do? Cardinal tetra trouble
My 36 gallon is well planted, water tests are good, the 10 cories I have in there are fat and happy and the ghost shrimp are doing well. However, over the last few weeks, I've added 10 cardinal tetras in two batches, only to have all but one of them die (not all at once but over the course of the last 10-14 days). I'm sick over the deaths and very hesitate to add more, but I also know that poor lone survivor needs buddies. What should I do?

The cardinals came from a reputable LFS and were farm raised.

Geomancer 07-17-2012 04:26 PM

Some thoughts:

"water tests are good" Do you have numbers? What some people call good can actually be pretty scary ;)

Now long has this tank been set up with fish in it?

What are your water parameters (pH, GH, and KH)? Temperature?

Varkolak 07-17-2012 04:32 PM

I've never been able to keep cardinals or neons alive because my water is too hard and the ph is too high, sounds like the same for you but we wont know until you post numbers

KPainter 07-17-2012 04:36 PM

The water isn't hard, but the ph is on the high end. Starting to think that's the issue. Might just move the lone cardinal into the smaller tank with the Von Rio's I have and let him hang with them.

Also, tested my water today and everything was good except for the nitrates. Did a 30% water change and added some Prime.

sidluckman 07-17-2012 05:08 PM

I would save rainwater (yeah, right!) or use distilled to mix with the water you currently use. One summer I did this, gradually lowering the pH of my Angel and Bleeding Heart tank until it was fit for the Amazon. I never saw such colors on those tetras before, and I never had angels spawn so willingly. We take for granted that many fish are captive bred and most are more tolerant of conditions far from what their ancestors would have survived. Still, I think of tetras as very fragile fish, and maybe we need to treat them more carefully.

How long do they survive before the succumb? Do they do well initially, or never take hold? How do you acclimate them (what method do you use?). Do you think small live or frozen foods would help? Are there any other symptoms or signs of disease or just mysterious attrition? Anyway, best of luck. . .

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