Planted Aquarium Microorganisms

I have had a 1 gallon, a 3 gallon, and finally a 10 gallon aquarium. It’s fascinating how microorganisms seem to spawn from thin air. I’m slowly looking at water samples and trying to identify and document all the types I find. I don’t have the best setup for microscopic photography; I’m just holding my phone up best I can. Some of these are also screenshots from slow-motion videos, because some of these critters move fast!

These photos are from November-December of 2024, when I didn’t have proper microscope slides or covers yet. I just put water samples on any clear plastic thing that would fit under the lens.

Nov. 26 2024 An ostracod, also known as a seed shrimp
Nov. 24 2024. I’m not sure what this is. Perhaps some type of small nematode? My aquarium has a bunch of these on the glass, they grow to only a millimeter or 2. Note that the dark spots are not eye spots. I think it’s food being digested; I watched it move all around the inside of the body.
Dec 24. 2024. An unhatched leech inside of an egg sac. I found it on a piece of Vallisneria I brought home from the pet store. There were 3 leeches inside of it, I think they’re called snail leeches.
Dec. 24. 2024. A baby bladder snail, the natural prey of the leech above.
Dec 24. 2024 A cyclops copepod.