Guess what? I will never take vacation with fry in my tanks. OK this did not work very well, maybe overfed or some infection got to them without water changes. I came back to 6 dead and just removed another 12. The rest don't look very good but I did 2 water changes and added salt an raised the temperature to 86. They are having a hard time breathing and they are a bit erratic. The waster was ok ammonia 0 and nitrite 0 and nitrate below 20. A few seem not affected those are little larger. Time will tell.
Just Call Me Chuck
Disclaimer : I am an old man and all this information is from the top of my head so any mistakes noted I claim the 5th
Bummer Chuck. Sorry to hear that mate