We just moved into a 40yr old house, 2 days ago. It's 11pm and when we flushed the toilet black crud bubbled up from the drain in the tub. We now have water leaking around the edge of the tub and the toilet. What is happening? Can I fix this or do we need a plumber?
Best to call a plumber ... That's what they do, amongst other things. Sounds like the drain is blocked down stream of the bath and backing up the drain in to the tub. That black gunk is likely nasty stuff from the drain.