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Max Taffey
10-19-2006, 9:51 AM
20-gallon aquarium
planted
Ammonia - 0 mg/l
nitrites - 0.3 mg/l
Ph - 7.5
Temp. constant at 24 degrees Celcius (74 F)
15-20% water change weekly

This is a new aquarium, set up approx. 4 weeks ago. The first inhabitant was a kuhlie loach. This was a very HARDY fish. He was the last survivor of a swampy, very neglected work-place aquarium that was his home for approx. 5 years. He even lived for 3 weeks in an unheated bowl while my I set up my home aquarium.

He adapted well to the new aquarium, eating well, even coming out in daylight (he was strictly nocturnal before) and resting among the plants, etc. I added two more kuhlies about a week later, as I understand they seem to "enjoy" the company of their own kind. The new two adapted equally as well, cruising around in the day, exploring the driftwood, curling up in plants, eating well.

This past Saturday I introduced two dwarf gouramis to the aquarium. By Sunday, the three loaches had disappeared, which didn't surprise me, as I know they can be shy of other fish. However as of today, all three loaches are DEAD. In the span of 5 days, all three seemingly healthy loaches had died. I observed the last one carefully...his colour was fine, but he was on his side, breathing very hard.

The gouramis are fine. No sign of illness, were taking food from the first day, and continue to eat, and behave normally.

One thought I had was that the gouramis had brought some kind of contaminent with them that didn't affect them, but killed the loaches, however, I've ruled this out because I actually purchased both the new loaches and the gouramis from the same store, and they were housed in the same tank. I've been back to the store, and all the fish in that tank still seem healthy.

Does anyone have any advice or thoughts as to what might have killed the loaches in such a quick time??? By the way, I test my own water, but just to be sure, I brought it into the store for analysis, and it was fine.

Star_Rider
10-19-2006, 10:03 AM
actually your tank is showing nitrites which can cause gill damage(affecting the fishes ability to process O2).

the tank is not cycled if it is showing nitrites.

keep an eye on the parameters and be ready to do water changes as needed.

if I had to guess..I would guess that the addition of the gouramis may have cause a small spike .

there are actually two courses of action..one is to introduce some NaCL(aqaurium salt will work) the idea is to change the chemistry enough to slow the absorption of nitrites by the gills. the other is to do a 20% water change to reduce the concentration of nitrite.

Max Taffey
10-19-2006, 11:04 AM
Thanks. It must be that the loaches are more sensitive to the nitrates than the gouramis...maybe because the gouramis can breathe at the surface. I hoped that the loaches would be a little more tolerant...feel bad for killing the poor buggers.

Question - should I now wait until the tank is fully cycled and nitrites are zero before adding another couple fish? One person I spoke to at the store said I should add 2-3 more now, but I'm not certain how reliable that is.

Thanks again for your help.

wataugachicken
10-20-2006, 3:48 PM
wait until nitrites are zero.

jm1212
10-20-2006, 3:49 PM
i wouldnt add anything until your tank is fully cycled, which would make your nitrites 0

WrittenLyric
10-20-2006, 7:50 PM
Better to be safe than sorry, I would definitely wait till your nitrites return to zero before chancing any more fish. Good luck :)