You might also enjoy 'Habitat Forge'. It's not as mystical or enrapturing as the Natural World Facts ocean videos, but it does help one appreciate a much nearer form of aquatic animal that we normally never think about: those living in ponds near to us. https://www.youtube.com/@habitatForge This fellow collects pond water or ocean water in jars and aquariums, forming small closed ecosystems, then films it. It really is fascinating. If a may fly or crab or mosquito needs to escape the jar, he releases it, so there is no cruelty involved. I am not for aquariums that trap fish who might wish to go beyond the tank's boundaries, but I am not convinced that these much smaller life forms know the difference. He observes scuds, aquatic worms, mosquito larve, etc. The diversity and resilence of life on Earth, even in just a cup of pond water, is truly amazing. He watches them forage, reproduce, predate, molt, etc. I was so fascinated by this that I took up the hobby myself, following his example: put sand and gravel in the bottom, pond water, then some aquatic grass or moss, all from the same location. Just yesterday I release about 4 mosquitoes that had fully matured in a jar and wanted to be let loose. There are still scuds in there bouncing around. To get a good look at the creatures one can hold the jar up to sunlight. I will eventually pour the contents back into the pond.