Have you tested your water lately? Hows your temp, SG, ca, alk, nitrates, phosphates?
Anything die off that could create an ammonia spike?
Anyone or anything able to get into your tank while not looking?
Unfortunately troubleshooting is like playing 20 questions.
Is your signature updated and your tank is only 1 month old? Are you possibly having a mini cycle or was the tank ever completely cycled? What kind of lights do you have and how close are the mushrooms to it..
Again, sorry for so many questions, but in this hobby a picture is worth a million words, but we just need a few more to really get a diagnosis going