You can’t have any light get into where the roots are. The slots in your home made net pot are too high up allowing light in. White lid also is no good.
Quick fix lol, hope that'll be sufficient for now.
The "covers" i had at first were made with white lids and just had some foil over top to block light. The blue ones fit better and I haven't had any water temp issues.What happened to your covers? The lights are just heating up your pails and the blue lids dont block all the light.