I was just looking at my tank and then i saw this 1 cm long black thing float by and then my betta ate it. I think it was a worm, it was fatish. I originally thought it was a big thick poop but when the betta ate it, he didnt spit it out. If this is a worm, is it harmful?
/www.maine.gov/ifw/fishing/fishlab/vol4issue9.htm
im really not sure.