Most detailed Fish and Fire place wallpaper, can you help?

my dad wants to have a "very realistic" fish and fire place wallpaper for his windows pc.
and le me knows that wallpapers are the place to get virusses so instead of downloading a bunch of them i ask you guys.

wich one is good and where can i download it?

Just google the images you want and right click on them and 'save image as' - wont get a virus doing that

not a picture screen saver, i mean a actual legit screen saver.
not a slideshow.

you said wallpaper lol

Just download a youtube video in 1080p and use that.

For a fireplace that is the best choice.
However! For a aquarium the software caller Dream Aquarium is the best and much fun also realistic.