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They are not moving.. they are not on glass, they are sticking on the black panel of BioCube tank..Do they move or are they stationary? Are they only on the glass?
My first guess is copepods which are good scavengers and fish food.
Kind of.. when i try to remove its not coming off and i feels like a shell (little hard stuff)..Like this:
Are they good ?Spiriboid worms
They are good filter feeders. However you will start to see a lot. Every time I clean my tank I always scrape them off my back glassAre they good ?