We are so proud. We know it is 72 because we counted when we moved them out of the 10 gallon into the now bigger tank. The custom background is courtesey of our 2 daughters who are 8 & 10, they wanted to make something special for the new babies. Unfortunatly, while we haven't lost any, we do have a few that are starting to show signs of deformity, i.e double anal fins, one who only swims on his side, etc. All in all, the number will be closer to 65 I think. But, for the most part, they are all doing great. The culling will be the tough part, especially for my 8 year old, she thinks we should give all creatures a chance, she doesn't quite get the concept so it will be hard for her. Needless to say, we are trying to do that part of things without her knowledge.