I caught a bunch of turtles in my lake about 9 of em and put them in my 30g thinking I would be able to sell them but my LFS says there too big, So I get my new silver aro today and put it in my 55g and my FH starts bullying it so I put it in my 30g (and btw I got rid of the turtles before I put it in the 30g) and I noticed these little worms stuck on my glass slugging around so I get my magnet cleaner thing and scrub them all away and I don't see them anymore and I put my aro in their. I'm just scared these will harm my aro and there may possibly be other parasites in the tank, I actually found two leaches in the tank so I burned them and flushes them lol.
