Dark Posted February 21, 2006 Report Share Posted February 21, 2006 I had a spawning of Corydorus aeneus about 6 weeks ago, and the babies have been growing up nicely, with minimal losses - they are about 12mm long now Yesterday I came home to about 10 dead ones floating on the surface of the water, and a few live ones doing the same... The ammonia levels were a bit high (15 - 25 ppm) so i did a water change and got the levels back down below 15ppm - i think this happened because i changed the filter in the tank... but i noticed that some of them were still floating up to the surface this morning. I recently started feeding them ground flake, until now they have been on a soul diet of microworms and baby daphnia - don't know if this makes them more buoyant? Any ideas what could be causing them to float to the surface/die? Quote Link to comment Share on other sites More sharing options...
Faran Posted February 21, 2006 Report Share Posted February 21, 2006 Did you just swap the filter in one go or did you let them both run for a few days to build up bacteria? In BB tanks the cycle might start all over with a sponge filter swap. Keep in mind that ammo-burn is pretty serious gill damage so they may still be feeling the effects from the spike yesterday that prolly killed the other ones. Work on establishing a proper cycle again? Quote Link to comment Share on other sites More sharing options...
Luke* Posted February 21, 2006 Report Share Posted February 21, 2006 The ammonia should be zero. It takes 2 weeks for a fresh filter to 'cycle' when put in with an an existing cycled one. Quote Link to comment Share on other sites More sharing options...
Caryl Posted February 21, 2006 Report Share Posted February 21, 2006 The change in food would have altered the ammonia etc levels too because there would be more waste and leftovers than when they had live food. Quote Link to comment Share on other sites More sharing options...
Dark Posted February 21, 2006 Author Report Share Posted February 21, 2006 well i have the N problem under control now, so we'll see if that has any bearing on the numbers dying i'm still concerned about the ones floating to the surface that are alive - they try to swim down to the bottom again, but just float back up to the surface - i noticed this long before the N problem, it is just more prevailent now, and i am concerned that the N spike may not have effected them at all considering i got to it quickly Quote Link to comment Share on other sites More sharing options...
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