Apistogramma agassizii fry die off??

[starforsaken]

Hello,


For the most part I have had success raising all the apistos I breed... However, these double red agassizii seem to be a pain.

They always eat their eggs so I have to artificially hatch them, and I found that their eggs fungused easily. Using fungus cure and darkening the tank, I end up with 0 fungus.

So anyway I had a batch of about 25 fry in a 10 gallon tank where they have been eating and living happily for about a month. They have a box filter and a heater set to about 78 or 80F. I did a 50% water change about 3 days ago and they seemed fine after. The water I changed wtih by the time I got to their tank was a bit cold. However, they were swimming around and eating the next two days without problem. This morning I went to feed my fish and found like half of hte fry dead or half dead.

Any ideas???? Immediately I thought it was the water change. but I did that on saturday and they died this morning!

 

[depthc]

Is there a heater in the tank? If youve been doing water changes regularly then water quality isnt the problem.

Andrew

 

[cdawson]

Hello,


For the most part I have had success raising all the apistos I breed... However, these double red agassizii seem to be a pain.

They always eat their eggs so I have to artificially hatch them, and I found that their eggs fungused easily. Using fungus cure and darkening the tank, I end up with 0 fungus.

So anyway I had a batch of about 25 fry in a 10 gallon tank where they have been eating and living happily for about a month. They have a box filter and a heater set to about 78 or 80F. I did a 50% water change about 3 days ago and they seemed fine after. The water I changed wtih by the time I got to their tank was a bit cold. However, they were swimming around and eating the next two days without problem. This morning I went to feed my fish and found like half of hte fry dead or half dead.

Any ideas???? Immediately I thought it was the water change. but I did that on saturday and they died this morning!

You use a tap water filter don't you??? I know because of all the rain we had our chlorine dosage go up and the calcium levels raised as well. It's possible the temperature change was a bit much for the bio filter and caused a mini cycle. The sudden spike of ammonia, even though small could have easily wiped out a batch of fry. How large of a temperature swing was it?

 

[starforsaken]

In retrospect, I think it was like a 5-10 degree change. We hadn't noticed the hot water ran out...

 

[cdawson]

In retrospect, I think it was like a 5-10 degree change. We hadn't noticed the hot water ran out...

That really shouldn't make a difference then, a 5-10 degree change wouldn't make that large of a temperature swing in the tank overall. I'm puzzled.
Or was that temperature swing in the tank?