Sorry about your losses. I cannot imagine how the sadness you are going through. But I am sure all of them appreciated your love and care and the lovely tank you set up for them as home.
Last time when my guppy died in QT due to columnaris I left the planted tank continue to run at 84 for 3 days, 82f for 3 days, 80f for 3 days, 78f for 3 days. Lost my Pygmy chain sword due to the heat.
Then run tank T 76f for 1.5 months with just shrimp and GM snail before introducing Curious Grace into it. She's fine... so far. HTH.