I just had a pair of convicts spawn in a 50 gallon tank and thought it might be interesting to document the process.
3/6/2014- eggs were laid over the course of about 2 hours between 6:00-8:00pm. They used a very small jar as a nest site so they couldn't both fit in at the same time. They had to take turns in the jar, first the female would deposit a couple eggs, then exit the jar so the male could come in and fertilize. I estimate about 80 eggs total- not nearly as many as I have seen in the past.
3/7/14- both parents guard the nest and take turns feeding so the eggs are never left unattended. Female spends most time inside the jar, but she will exit to let the male fan the eggs . They are digging a large hole right in front of the jar and clearing plants away from the opening.
3/8/14- all continues to be well with both parents very attentive to the nest. I notice that many of the eggs fail to develop and are removed by Mom. Looks like about40-50 eggs remain at bedtime, at this point I'm starting to worry about the viability of the spawn because the male is very young and the female is quite old. I did a 4 gallon water change to keep parameters as stable as possible.
3/9/14- eggs hatched! About 2:00pm I looked in and the eggs were gone! Closer inspection reveals a mass of wiggling grey dots in the bottom of the jar... live fry. I know convicts are sooooo easy and I have bred them in the past, but this is a really exicting turn of events, totaly unplanned, and I'm really committed to taking care of these new lives.
I have photos that I will post soon!