A quick update on the eggs, been monitoring them like a hawk over the past 72 hours. None of the eggs have hatched yet, but the 2 female bronze corys have kept producing more and more eggs! While most of the 200+ were eaten, there are now another 400+ eggs in the tank! Is too much mating a bad thing? Sometimes the corys would like a bit tired during the day, and no there aren't digging the gravel for food like they used to, they either rest on the gravel or chase each other around!!
congratulations on the eggs!!!when my pepered corys laid eggs i removed them from the community tank (as my peppers & goldfish were eating them,i only managed to save 20).i used an old plastic credit type card & gently scraped them off the tank side (some people use razor blades or there finger).once in another bare bottomed tank i placed an air stone directly under the eggs to stop fungus from forming.mine took 5 days to hatch at a temp of 24 degrees C.out of the 20 eggs i saved 16 hatched but iv only got 12 left (there 32 days old now),so its doubtful that all the fry will hatch or survive.you dont need to add a sponge filter til there atleast 4 weeks old (from what iv been told by peope on here).
to hatch & rear 120 fry til there big enough to go into your community tanks or to give away you would need quite a big baby tank so think carefuly about how much room you have to raise them in.
im suprised none of your other fish have tried to eat the eggs but they will more than likely eat they fry when they hatch cus to them they will just look like food.
i dont think that a breeding trap would be big enough to keep that amount of eggs/fry in IMO.if i was you i would probaly remove half the eggs from the tank & put them in there own tank cus its easier to care for the fry & make sure they get enough food and are kept in clean conditions without competition from adults etc.thats my opinion anyway.
good luck with the eggs & keep us informed of what you decide to do and how things turn out!

x
Hi flumpit2, thank you for the informative reply!

How are your baby corys doing? Are they really hard to take care of compared to other adult fish?
I've taken out the eggs and put them in a plastic container, filled with 70% of the tank water and floated the container on top of the tank, so the water maintains the tank temperature. I've also put an airstone inside the container. Is this ok for the fish or am I better off buying one of those little breeding tanks? (though these are more for guppys and plattys) I know they might be too small for a few hundred eggs (depends how many hatch and survive) but I am prepared to buy a few breeding traps if this is best for them as I cannot fit another tank in my room. I've got a smaller 29g tank, with neons, cardinals and other bronze corys, so would it be okay to house the fry there instead when they hatch? I'm assuming the neons, cardinals or the bronze corys will NOT eat the fry!
Why would I need a sponge filter for them once they reach 4 weeks old? What purpose does this serve? If I'm using a canister filter at the moment, would I still be able to use a sponge filter when the time comes?
It seems the other fish have eaten a lot of the eggs, hence why I've taken them out now. I wanted to leave them there before and let nature take its course and let the strongest survive but they have a better chance without other fish trying to eat them before they even hatch!
What food do you feed them and are there any special things I need to consider to keep them safe once they hatch? Like keeping a certain temperature, feeding them a few times a day, daily water changes etc?
None of the eggs have hatched yet, but half the eggs have gone from white coloured to brownish, is this a good sign? What do the fry look like once they hatch?
Sorry for all the questions, I just wanted to know more about how to handle any 'what could go wrong' situations once the eggs hatch!