Hey so a few days ago I decided to do the usual aquarium check, not expecting anything weird since all my water parameters are alright to the best of my knowledge, etc. When I looked at the walls of my aquarium, I noticed these little...things....or spots, I don't even know, just sitting there. At first I thought, ok, I have some green spot algae, maybe this is some sort of...brownish white equivalent or something. So I let it go thinking I'll do some research about it and figure out how to treat it. Later in the day I checked again and literally every single spot was gone. So I figured, hey, my otos are doing an amazing job keeping my tank clean! And that was that.
Today, I turned the light on and I saw the same exact spots all over the walls again. I decided to look a bit closer and I saw that all of them have roughly the same shape and size, and they all have what appear to be two antennae sticking out. I checked to see if they're mobile by using something as a reference, and, even though they're slow, they are moving around.
What else is weird is that the second I turn on the lights, it seems like they all try to run and hide so that now, 20 minutes after the lights came on, my tank looks relatively sparkling clean.
My tank currently has 2 guppies, 1 red dwarf gourami, 2 otos, and 4 mystery(apple? unsure) snails. I'm pretty sure I've seen my snails mating before, but I never saw them laying any eggs, and I doubt they would because I keep my water level pretty high and I read somewhere that they lay them above the water.
In any case, has anyone seen these things before? I'm attaching a slightly out of focus picture which took me more than 10 tries to get because they're so small. You can see the antennae on the one in the center pointing toward the bottom left corner of the picture.
For the record, my parameters are 0 for ammonia, nitrites and nitrates.