Well thats some useful info. I suppose if I payed attention to collecting eggs, I might have done better
So you hatch/raise them seperately I assume? Can you tell us newbs a little more info on your process?
I'm still kind of a newb myself. This is my first attempt at breeding corys. I've had pepper corys spawn successfully in my 55g somehow. I think it's b/c they spawn so frequently that a few are bound to survive due to sheer numbers. My panda adventure is mentioned in previous posts . Eventually I will try to breed the panda's but I'm going to focus on the Sterbai for now.
I'm a huge believer in live food so I did most of my conditioning with grindal worms. I've got 4 cultures going that I use to feed from more days than not. I rarely feed on Sundays. I am usually able to harvest enough to feed 3 tanks heavily twice a day with some loss to other fish in the tank. I supplement with blood worms, daphnia, ken's earthworm sticks, and ken's sinking cory sticks. When I put zucchinni in the tanks for the otos I do see cory's nibbling on the pieces that are on the bottom. So I'm not sure if that helps with conditioning, but I know it doesn't hurt. I also feed Ken's algae wafers and veggie sticks in the tanks for the oto's. I feed those mostly at night and I'm sure the corys eat some of those also, b/c the tank is spotless by morning!.
I perform 80-90% WC's every 2-3 weeks. The water isn't freezing but it's definitely colder than the water it is replacing. The tank temperature usually stabilizes in a couple hours. This could be a trigger for the Sterbai to spawn, but I have delayed the WC b/c they are in the middle of a spawn 3 weeks after a WC. IME the spawn is more so triggered by conditioning and good water quality. My water is really hard according to the test strips I used a while ago so I'm not sure what factor that plays in the equation.
Once I see spawning from the Sterbai I try to pay attention to where the female is placing the eggs b/c her initial spawns were really small. The last 2 spawns she has taken a liking to the glass so the eggs are really easy to spot and collect. 2 or 3 initial spawns were unsuccessful IMO b/c the eggs weren't fertilized, but the last three have been robust with all of the collected eggs hatching.
I use my fingers to collect eggs of the glass. Some eggs slip and float to the substrate, but are easily sucked up with a pipette. If the egg is on a leaf and I can't get it off with my fingers I will just trim the leaf. Once collected I place the eggs in cheap plastic cups with several holes poked around the lower 1/4" of the cup and one hole in the bottom center. I've hacked the hood on the Panda's 10g for other purposes and the opening created is a perfect size to "float/wedge" the cups against the hood and the rear edge of the tank. Initially I just leave the eggs in the cup. As I see them getting ready to hatch (4-5 days) I will place a small bunch of java moss in the cup. I perform daily 50% WC's on each cup and attempt to suck out the crap at the bottom of the cup with a pipette.
7 days after hatching I start with really small grindal worms. The fry actively hunt them down and it's a pure joy to watch. By the next WC the majority of the worms are usually gone. I repeat the WC and Grindal worm process until the fry are big enough for me to find in my 2.5g tank. Once transferred to there I continue to feed the grindal worms but also start with all of the same food used to condition the parents and some of Ken's flakes to grow them out.
Wow, that was a lot to type...