@panzade,
about 20 years ago I had fan tail gold fish and at about 2years old one laid eggs I got out as many as I could and as I didn't have another tank I did a makeshift it worked, just a bowl with some baby food and a tube blowing some air into it, they did fine till my autistic grandson thought he would help, he thought it he was cooking and stirred them they died in a couple of days but if I had time to put them in a proper tank they would have lived. But I wasn't quick enough, shame, but I didn't do anything fancy they did grow to about 1/4". I now have mail and female they killed the other 2 they are 1/2 years old she has a big belly but I wont save the eggs.