I recently just bred these fish in a 150 L tank with various other New World/American cichlids. I moved them to a 45 L because it's the only spare tank I had. I recommend moving the fry when they are free swimming, along with the parents, into a tank 75 L or more by themselves. I made the mistake of moving the fry when they were just born and lost hundreds. Note: to get them to breed: when you do a water change, as you pour new water back in, use COLD water or R/O water because this simulates rain and this is the time when these cichlids breed in the wild. Wait a week or 2 and you will have fry. You can also turn the lights on and off to simulate lightning if you want. They're an overall great fish to keep and do very well with New World cichlids.
When it comes to jewels I have found that, once you establish a breeding pair, if you remove the fry after one week the parents will gift you with many more almost immeadiately. I currently have somewhere in the 500 range of growing babies. The good news is that they grow rapidly and can be taken to the local pet shop after 2 months. I raise mine with other African cichlids and boy do they guard their young. I have a turquoise female and a red male. Everyone enjoy your jewels.
I have had three jewel cichlids for the past 2+ years, which were inherited from a friend's roommate who moved out of state and couldn't bring them along. Actually there were 9 siblings and a father, as the mother died sometime after their fry had hatched. So after giving the rest away, I was left with 3 of the young fish, which I had known ever since they were born. Unfortunately my one male--who had a mutation which might have contributed to his poor health--recently passed away, but previously he and one of my two females had laid eggs together several times (none ended up hatching). It was fascinating to watch when I caught them at it! I didn't have to do anything special to encourage them to breed, they just started on their own. These are great fish, absolutely beautiful, and it's easy to tell when they are happy and healthy. I call them mood fish because their coloring is so much better when they are not stressed.
Jewel Cichlids. I have been keeping these fish for 2 years and can say the following with confidence. They do well with other African fish of a similar or larger size. They breed like crazy. The fry are as mean as the parents, eating all other fry. I had about 100 fry recently in a 30 L tank and there are now four left. Of course a larger breeding tank and more food will always result in more fry, however, being fed once per day and little attention has caused my last batch to cannibalise each other. Keep the fry with the parents as long as possible to ensure tbe parents can impart the proper growth hormones and care for the young fish. You will be amazed at the differecne between the size of fry raised with parents and those without. Without = low growth, about half the rate of those with parents. But watch the male. He may eat fry.
These pages have enough comments to give the reader a basic idea on the topic. Further comments are still very welcome (through the site's contact form) as long as they provide new and/or advanced information not yet discussed in the existing ones.