Free-swimming fry are as in previous rounds not totally free-swimming. They are staying tight in the spawning substrate. Very few evident swimming in open of the tank even as I pulled it out to look. Then, as I replaced it several dozen came out briefly before swimming quickly back into the substrate. Previous iterations of early rearing also showed strong association between cover and even first feeding Pirate Perch. The cover / spawning substrate used this time is much closer to natural root-wads.
Freshly hatched BS applied today and the Pirate Perch fry were all about that.