A lot of people requested a video of my turtle... so here you go! I'm not sure if this will be relaxing but I do enjoy watching him swim around. There's not much to listen to in the way of white noise... I had to turn his filter off because it has been acting up and is very noisy. For those who are wondering, his name is Toby and he's a red eared slider turtle who is about 8 years old. He lives in a 120 gallon tank and has a basking area above the tank (you can see the ramp in the video). There are also fancy guppies in his tank which were meant to be food but have kept reproducing.
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app