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thanks for helping.They are easily removed.Just like the dust in the ocean.Detritus is basicly composted poop and left over food and is mud like and collects in corners and where water flow slows down. Are they hard and have to be scrapped off? Because it looks like a small calcifying crustracian or worm. If so there's no way to prevent them althoufh as other things start growing they will be less noticable.