I've moved into a new place that had some mould growth on the ceiling in one of the bedrooms. I found a leak in the roof that corresponded and patched that up and cleaned up the mould. A few weeks later, it's back. I couldn't see any additional moisture up in the roof though. Can mould subsist on paint? Or the latent moisture in the room? Or does this indicate there is moisture getting through still, possibly just a small amount that wasn't visible when I checked it.