The Java moss in my fish tank was too overgrown, so I trimmed about 30% of it, and baby fish practically poured out of there. I don't know exactly how many there are right now, but the last time I counted, there were over 50, and the average age of my Corydoras is probably around 15 years old. More than half are fish born in 2010. And their parents are still healthy. Sometimes when I tell this, my mom tells me not to lie. Fish look slightly different, so you can tell them apart. However, occasionally, when a baby who looks a lot like their mom grows to a similar size, the difficulty level increases, just like a Mii silhouette quiz with the same shape Mii.