hi, congrats on the eggs - commiserations on losing them to the community tank
This is unfortunately what happens in community tanks. My peppered cories lay their eggs on the glass too and I have the same problem - they disappear in minutes. My panda's are bit cleverer, they lay them on leaves, especially the underside of my java ferns and so I get the odd baby panda turning up. I set out with 4 panda's, I now have 6!
So to answer you the best I can. Cory eggs are very soft to begin with and so removing them from the glass can be difficult. Aswell as being soft they are also sticky and so sometimes you can lightly touch an egg and get it to transfer to your finger. You then need to transfer it again though into a seperate container (the eggs need to stay wet and so any container you use needs to hold some tank water) and so the chances of popping the egg are high. The best option is to hope she learns to lay them on a leaf and then you can just break off the leaf and remove that!
To get cory eggs to hatch you'll really need a container with no holes. I tried the breeder net and found that the baby cories could escape and I lost them all and so I went out and bought a very small Clearseal tank - it's only 18 inches long, and holds just 30 litres, so takes up very little space. You'll also need to get a sponger filter - these run from an air pump. You'll need this because baby cories can not handle any kind of current or too much flow. The sponge filter also doubles up as a feeding station as it will get covered in microscopic stuff that the fry can eat.
I always kept my tank bare bottomed until the cory fry got to be about 1cm and then I would add a little sand. I found the bare bottomed tank - stood on something white helped me to see any dead cories and also to see them to remove them when I needed to water change their tank. I found it best to use water from the parents tank for the first month and then I could gradually use fresh water. I found baby cories to be incredibly sensitive to any small changes is water.
For the first 2-3 weeks of life they were fed liquifry and then I would gradually add a tiny amount of TetraMin baby to the liquifry in a little pot (I used a medicine measuring cup) mixed it well and then added it to their tank. I would gradually reduce the liquifry and increase the TetraMin baby over about 10 days. You will get some fry that won't make it - this is inevitable but if you keep the tank clean, water change 3 times a week and make sure the water stats are good you should get a good amount that survive.
If you want any more advice or help then let me know
