They are growing fast! I'm starting to give them CO2 in tablets: 1/4 of a tablet in water and 1/2 of a tablet in aero (a cup of water inside the grow box every other day). At the end of the week I think I'm going to spray them with a bit of Vita Race but I'm not quite sure this week or next. Then I'll start to poke some holes in the soil and inoculate a 1/4 of a spoon of Guano Bat to enrich the soil.
A couple of them have been "falling" so I used a small stick to keep them upwards.