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Daphnia? Good sign or bad sign?

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So I have this 10g planted tank (see image below) ...and i have been seeing these small little tiny creatures everywhere for a while now. I think they are Daphnia, because I'm not sure what else it could be. They are small round white bugs -- too small to pick up on my phone camera (although you can kinda see it in the image below in the intake sponge). They jump around the tank, they're mostly on the bottom of the tank or in my filter intake sponge.

I don't mind them, but I want to know if this is a good sign or bad sign of a healthy aquarium? If they break down waste and help keep my planted tank clean, etc? Or could it be any other kind of bug?

additional note*
I haven't done any water change for... i dunno... 5 months.. (don't judge me) ...because I want to try to create a balanced aquarium. (minus the added ferts/DIY CO2/carbon filter) ...all dwellers seems to be fine I put very little food for the one molly and ammonia levels are always good. I also trim my plants every 1-2 months






Plants:
Dwarf Hairgrass
Lilaeopsis Brasiliensis
Ludwiga arcuate
Bacopa (Bacopa Caroliniana)

Home of:
50-100 RCP
1 male black molly
4 nerite snails



Thanks in advance,
lostraindrop
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Good video aid pertaining to your questions. I can't provide a 'definite' answer from viewing your video, hard to say with certainty. Put under magnification would probably reveal some definite answers. Maybe someone else could chime with a higher degree of certainty. I do think you are on the right track though... with your reference of size. Sayurasem mentioned copepods with 'jerky movements'. Daphnia and copepods both make those type of movements.

Daphnia are considered good water quality indicators by water professionals (Daphnia Magna are used often in a bioassay to monitor water quality). As to copepods: I've never encountered any problems with small populations established within my tanks. This is just an opinion (for what it is worth & taken with a grain of salt per se) - I think that overfeeding and water quality deterioration factor into large populations of copepods forming in an aquarium.
 
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