Spotting

Since you're spotting multiple critters, each one should get its own separate posting. The long algae with the spiraling chloroplasts (pictures 1 and 5) look like Spirogyra longata or perhaps more than one Spirogyra species. Picture 2 looks like cilliated protists of some sort. Picture 3 is a chunk of plant material (no idea as to a more specific ID). Picture 4 is some sort of arthropod (I like that you can see its digestive tract).