Woke up this morning to at least 80% of my first BN batch babies dead. They're all approx. 2cm and water parameters nitrite - 0, amonia - 0, PH 7.2 - 7.6, Nitrate - inbetween 0 - 5.0. Any idea what could have caused this?
Adults all seem ok, and had 3 new babies in a nursary which have just started to gain their colour, which all seem to be ok.
The only chemicals I have recently added to the aquarium are Sera florena plant fertalizer and have been doing so for 3 weeks (a small dose each week).
Yesterday whilst doing a water change i stupidly forgot to add water conditioner but realised after putting the water in, so added the conditioner to the tank and disturbed the water in order to mix it up. have done this with other community fish and had no problems. could this be the reason?