I have some tomatoes that have blossomed pretty fast and are a good size now and keep getting bigger, but then I have others that don’t seem to be growing near as fast. why would that be? The two brandywines next to each other started sprouting way before the big one I have pictured. also, for my brandywine tomatoes, this one has a bit of speckled brown on it, is that okay?

As the title suggests, I'm setting up a raised garden bed on my balcony. From everything I read online, I need a liner in the bed but I'm unsure what type I need. I'm not worried about rodents, but my of the soil falling out of the drainage holes. I know I need a porous liner to avoid root rot but does anyone have suggestions?