Yes, there was a weird noise and a guy that was staying at my daughters for a couple weeks kept hearing a strange kinda buzzing noise in the middle of the night. Finally tracking it down to the planted bowl which had a adf
Then I was asked what was in the plant bowl that would make a buzzing noise. I didn't know frogs could make a buzzing noise and found out by checking out some youtube videos, lol!!! What a surprise!
I guess that was a normal frog thing but I didn't know. I had heard the odd sound too but thought it was somebodies computer or something.
Side note - The adf, which had been rescued when I went to buy a fish tank and the person said you can have this tank too if you take the fish, which must have been 20 aqua critters in a 5G tank, and the Cherry barb bit his eye out on the drive home, it was awful, awful, awful. He survived and lived at least another year at a new adoptive home and with a new female frog to keep him company btw.