Fish Dying Off...

lizard

Married Lizard
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Hey, all!

It's been a loooooong time since I've been here. I still see some familiar names around here :)

Anyway, I've started having problems with my tank and thought maybe somebody could help. I have a 29-gallon tank, complete with sand live plants, that I've had up for, oh, at least three years. A few weeks ago, my tank inhabitants consisted of two angels, eight or so old (three years plus) Neons, a Siamese Algae Eater (true SAE), an Oto, and five Kuhlis. Filter is an Eheim 2213 (which probably needs cleaning). Water changes are done sporadically. I add water when it needs it. Fish got fed a few times a week.

A couple weeks ago I removed the angels and gave them to a friend. I want Rams again and when I had rams before, they didn't do well with the angels. Then I added the yoyo loach (I'd had him for quite some time, he was just in another tank - no problems in that tank). A couple weeks later, I bought some new plants and nine new neons. I got the neons at PetCo (I don't need a lecture on PetCo/PetSmart - I've gotten fish there before, they've been fine, and the fish in the tank I purchased from and the tanks around it looked healthy). I purchased a few plants there and a few at another fish store I've done business with before.

A day or two after I added the new fish and plants, I had fish start dying off. The neons were first and they kind of alternated new and old Neons. I've lost six so far - three new ones and the last three of my "old" group. I usually lost one every day or day-and-a-half. I did a partial water change at some point. Then the yoyo loach died (or maybe the oto was next). Then the Oto. Today I found my SAE dead. The kuhlis are the only unaffected ones thus far.

I've looked at the dead fish - I don't see anything unusual. No fuzziness, no weird spots, no odd blotches. They're just dead. All of the remaining fish look fine. No spots, no fuzzies, nothing. A couple of the neons were swimming around funny before they died, but it was more like the "I'm almost dead" swim, rather than anything that looked like something (clear as mud?).

Anyone have any ideas? Temp of the tank is probably around 78* F. It's not near a window, not under an air conditioner. I haven't sprayed any chemicals in the house recently, no painting going on. I've had fish for four or five years now and have not had this happen. I've had ich, I've had parasites, and other interesting stuff, but nothing like this.

Any thoughts/ideas/suggestions would be welcome.

Thanks!

Pamela
aka Married Lizard
 
What are your current water stats?

Some may have died from old age. However it sounds like your tank may have been used to the way it was for 3 years straight and now someting got changed. The change being new fish being added. This could have caused a disruption in the tank with the old fish. Could your tank possibly have caught the old tank syndrome? Such as not keeping up with water changes or filter cleanings?

I had this happen in one of my tanks and could never exactly get it explained. I thought maybe it was overstocking and the fish died however the tank was way understocked though, i double checked.
 
Maybe neon tetra disease :unsure: I would wait and see if Wilder replies and if not then post in the emergency section. Very sorry to hear about your fish losses, just lost one today myself. Good luck.

Drew
 
First Kuhli loach was found dead tonight...

I tested my water. My test are a couple years old, so I don't know how accurate they are. Ammonia didn't work. Nitrites were fine (I don't remember the number, but it was well within normal). Nitrates were about 80, which, if I'm remembering my numbers right isn't too bad for a planted tank. Phosphates (I tested them since I had the rest of my tests out) were between 2.0 and 5.0. Explains the rampant hair algae growth...

A couple of the dead fish I've looked at have looked like they might have some light red patches under their skin, but there's been nothing significant. I've added fish occasionally in the last three years. The angels were added about a year-and-a-half ago. The YoYo was added a few weeks ago. Might have added some Neons a while back - I don't recall.

So, if all my fish do die off (and it's looking like they will), do I need to tear down the tank and start over, or can I just let it sit empty for a bit and then start over?

This really makes me unhappy. I like all my fishies and I like that i"ve had 'em a long time. Maybe I'll try something a little different when I start over.

I do have some Pothos plants rooting in the tank (well, their stems are floating in the water and the leaves and the rest of the stems are hanging out of the tank). I've had a couple in there for a while and added a few new ones last week or so. I tried to think if I had sprayed my pothos plants with any sort of chemical recently, but I haven't. I've sprayed my Ivies (took them outside to do it, didn't bring them back in until they were dry), but they weren't near the pothos. Haven't sprayed any chemicals in the house, no painting, no varnishing, nothing.

Thanks for the comments and ideas.

Pamela
 
Test kits do go bad over time, so if you aren't sure how old they are you might want to try taking a sample of the water to your LFS (if you trust their accuracy), to see if the results differ.

80 ppm nitrates is a bit high. 40 ppm usually indicates it's time for a water change, and most people try to keep their nitrates under 10.
 

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