A little more than a week ago, I started leaf lettuce, romaine, and bell peppers and thought I could remember in which containers I put each one. After the shuffle to get them under the grow light, I lost track of which group is the leaf lettuce and which one is the romaine (the pepper had already been separated). One is lighter in color than the other, and if I had to guess the romaine might be the darker one, but how to tell? It really only matters because the spacing is a little different for the types I have. Rookie mistake.