Low to mid 80's isn't terrible as long as the entire water column is not mid 80's with low DO.
I have seen some populations stress to a point fungus and other problems pop up but the fuzzy looking saprolignia is most common. If that's not the case, I'm not sure.. Many variables involved. GSF are extremely tolerant of lower water quality and are not normally the first species to show up- but also, not all dead fish float. YP tend to hang out in deeper, cooler haunts compared to GSF this time of year which tend to be more littoral (close to shoreline) habitat.
I'm sure some of the more in-depth, experienced members may have some ideas but I can't say what might be going on.
I don't think it's anything you've done.
EDIT: You haven't noticed any damage or puncture wounds on any of these fish have you?
Last edited by Snipe; 08/22/20 10:44 PM.
