getting the timing right (i missed the hatch), and getting the air bubbles over the eggs right (I killed them all with too vigorous aeration).
Other problems:
Diluting ammonia with ammonia. I was trying to reduce the ammonia concentration in the larval tank with water changes. The water from my RO/DI had ammonia in it, unbeknownst to me.
So no matter how much water I excanged, I still could not reduce ammonia.
Carelessness. I accidentally plugged the heater into the light timer. No heat at night, so I had lots of death in the morning, and did not discover the source of the problem for 2 day. I lost 75% of the hatch....
Suspected problem: Use of chemi-clean in the parent's tank while eggs were present. These larvae hatched well, but died a slow death over several days. They never learned to eat, it seemed.
First 3 tries of raising premnas where withour success. Reasons:
1. Time. I work 10-13 hrs day and have 20 fish tanks, 3 cats and a partner
2. Trouble keeping rots and phyto in correct density, because of action 1 I assume
3. Seems my Selco 3000 is not good anymore (purchase dez 2004) so my rots seem not to have enough nutrients
4. Very slow larvae growing. My last fish from Jan.24. shows since two days strips and normal coloration which others achive after 8-10 days. Must be related to 3
5. Not working accurate enough, not keeping records of what has been done when to make trouble shooting
5. To often on business trips so that partner has to take care of fry, but she is not a fishomanic as me
But I am stubburn enough not to give up that early
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