The ideal nutrient temperature?

I've got a bucket and stop cock with a pump and necessary tubing for automated feeding, it feeds through the light cycle refills and heats over the 24hf period.
The tank temperature is 17c but the bucket temperature was up at 22/23c today presumably its been higher, its blacked out there's no problem as yet but I thought 22/23c was a bit warm?
The bucket sits near the dehumidifier hence the temperature so it should be easy enough to insulate it with bubble wrap for example, I've got some bubble wrap coated with mylar that'll be perfect but I need to know what parameters I'm aiming for, iirc 18/20c but I can't find anything specific with the search bar.

Wow outstanding iirc it's 18c, I thought nutrient temperature would be a straight forward question, maybe not?

Wish I could help. I'm ashamed of the name I chose... I know nothing on hydro grows and procedures, but I'm here for moral support lol

You should be aiming for 18 degrees c in your reservoir once you get over 22 degrees c in any part of your system you're you are in the danger zone where root rot can occur.