Posted: 19/04/2013 at 18:47
They are still tiny so ok in those modules for now. Thin them out so there is only one per module by pulling up all but the strongest seedling in each module (eg if there are two and one is tall and leggy while the other is short and fat, discard the leggy one.) They should be planted out when they have 5 true leaves, but not before the last frost has passed. If they seem to be out-growing the modules before then, pot them on into 3" pots. When you finally do plant them out, plant them so that the point where the lowest leaf emerges from the stem is at ground level, and firm the soil well.
At this stage, they need as much light as possible rather than warmth - a cold frame or unheated greenhouse is ideal.