So far in my experience plants will germinate in a flourish – a little rush to get one or two leaves out – and then they will stagnate for a week or so. Its during this time of stagnation that they usually focus on root growth. Last week our strawberries had barely broken the rock wool surface, featuring only their dicot leaves.
This week is different, in the sense that something only 1.5cm (just over 0.5″) could be different:
Growing Strawberry Temptation in Kratky Hydroponics, Week 3 Growth 
Growing Strawberry Temptation in Kratky Hydroponics, Week 3 Growth
It was quite hard to get my camera to focus clearly on such small details, but you can still see that the Tempation Strawberries are now going through a growth spurt. On all of the seedlings they are beginning to grow their second set of leaves.
It’s going to be quite a while before my plants will bare fruit, but I am still very happy with their progress; previously I had several months of attempts to germinating the plant with little success. The only method that worked in the end was stratify the seeds in the fridge for over a month. To get this far is quite an achievement!