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Getting it tested at the landlord's expense? Doubtful. At your expense, of course. If you have it tested and it's positive for mold, then you should be able to switch apartments with no costs but the moving (no new lease, no rent increase). If the landlord is smart (and you'll have to convince him he is) he'll do his best to get rid of the mold as soon as possible. Mold can become airborne and begin to affect other walls and units. If there's no apartment to switch to and you see mold again, spray the growth and surrounding areas with X-14 or plain ol' bleach. Try a search engine for mold and it's complications if left untreated. PS. Blowing air in the wall cavity isn't really smart. It blows the mold further wall the wall cavity. Watch where the wall meets the ceiling. 1 will get you 10 it's going to discolor black.