A very odd question

[marcingo]

So I put some live sand into my 55 gal tank that smelt like H2S. Now I have a wierd situation. The H2S smell went away once I spread the sand across the tank and added some water but then their was an odd moldy type smell so I opened my basement window over night and closed the door and put a fan on. When I went into the room in the morning the smell was mostly gone but for some reason everytime I go into the room I get this burning sensation in my nose. Could this just be from the ammonia from the cycling tank or could it be something else.

Anyone have any idea what is making my nose burn when I enter the room where the tank is? I went near the tank water and smelt it up close but it didnt have any strong odor.

I warned you lol its a very odd question.