Ugh, I had one of these in my 5 gallon a few weeks ago. I came downstairs unable to sleep at around 2am and flicked on the tank light to enjoy some quiet tank time and nearly screamed as I saw that exact size shape and color *thing* wriggling on the glass. I wrangled it out with tweezers and threw it outside to freeze to death.
I have not yet determined if it was some kind of giant planaria or a leech.
Regardless, I reach into my tank with more care since I encountered.....it. however, no deaths experienced of any major livestock of betta or chili rasboras. Nerite is ok and my dearth or pond and Malaysian trumpet snails are ok, too.
My tank journal.
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