Here are a couple photos, the best I could do out of many taken, of 3 of the 4 surviving fry from the original 7. The two together in the second photo are the largest of the 4, though still somewhat difficult to spot on the plant leaves. I moved these 4 from the 10g to the 20g last Friday and they are much more active, grazing plant leaves continually now.
I have various stages of fry still in the 10g, including 54 about-to-hatch eggs I moved from the 90g today.
A lot of the fry did not survive long. As the published reports all mention, feeding the fry is the real challenge, as they require very soft algae. I am sure the original 4 have survived because they had fresh green algae. Even with the 10g in front of a west-facing window with a fair bit of direct sun and an overhead light, I have been unable to keep sufficient algae; these fish are voracious algae eaters. I have tried blanched spinach, raw spinach, zucchini; now I have dry oak leaves in the 10g. I'm trying the oak leaves because as they break down they apparently exude very nutritious food for fish fry, and the Farlowella fry in the 10g have been eager to graze the oak leaves, so this may have better results.
Third photo is the male Poecillocharax weitzmani who just happened to stop motionless for a couple minutes while I was trying to photograph the fry; I have a pair in the 20g, which is otherwise full of small plants culled from the main Amazonian setups. And a shoal of Corydoras pygmaeus and C. habrosus.