Green Laser Cory Fry Dying!!!

Greetings From Boise, Idaho,

I recently purchased 8 breeding green laser cories! They have spawned for me twice, and I removed the eggs and put them in a 2.5 gallon tank with methylene blue, small heater, and 2 air stones. I waited 3 days, but unfortunately, many of the eggs fungused and did not hatch. But. I did get about 6 surviving fry each time. I moved the fry to another 2.5 gallon tank with a sponge filter, heater, and air stone. I fed the fry first bites, fry starter, and frozen baby brine shrimp, but only 1 fry has survived past the first 2-3 days.

I have successfully raised dozens of pepper cories using this method. But, I must be doing something wrong for the Laser Green Cories because this method is not working for them. Does anyone out there have any experience raising laser greens? I currently have 1 fry who is about 2 weeks old. My water is pretty hard here at 7.8-8.2. Should I try lowering the ph with some R.O. water? The adult cories are doing great in a 37 gallon tank.I have been using prime treated tap water for them with no problems.

Thanks in advance for any insight or suggestions any of you might have.
Best,

LIsa.

 

DoubleDutch

 

Yeah actually, hatch the eggs in pure RO water. Couldn’t hurt to try my egg fungus prevention method with 3% hydrogen peroxide. Simply squirt 1 ml of hydrogen peroxide per gallon every 12 hours until they start hatching.

 

Yeah actually, hatch the eggs in pure RO water.

Thanks! I'll do this. Do I keep the fry in the RO water when they hatch? If so, for how long? I have never had fry die like this.

 

Yeah actually, hatch the eggs in pure RO water. Couldn’t hurt to try my egg fungus prevention method with 3% hydrogen peroxide. Simply squirt 1 ml of hydrogen peroxide per gallon every 12 hours until they start hatching.

Uhhhh won't cause that osmotic issues ?

The fry dying could be caused by a lower tolerance to ammonia / nitrites / pollution.
More waterchanges could be needed.

 

For my emerald Cory fry nitrates above 10 spells uncertainty. Maybe they make it maybe they don’t. A drop of crystal violet on the eggs once will prevent mold

 

I would hatch in tank water and then match parameters with completely new water .
It is possible the cory are sensitive to the MB and trying the H2O2 might be worth it ..
I am debating switching to H2O2 for a fish that I keep also having trouble with fry.
MB left in water with fry/wigglers may cause permanent damage .
I have no trouble with some of my fish [none cories yet] using MB but I really wonder about one ?
I would be doing daily water changes even with a cycled filter for fry ..Just me .

 

Thanks guys! I have been doing more water changes, and have gotten a few more fry to live. Ironically, I have 2 fry that hatched on their own in the parents' 37 gallon tank with no help from me! I've been aging the water ffor the water changes after treating it with prime, and trying to feed less to cut down on waste. Thanks for the help and Ideas. They have made a difference as I have 10 fry now instead of just one.