yeah,,they have it bang on with watering tips and that,,but I too think it maybe a small bit N def. ,Maybe keep an eye on that wee small set of bottom leaves,,they looking abit discoloured. and when you look at them pic it looks alittle lime/pale green,,, but that colour could be the strain so Id water before taking any further action. Esp. since we dont know your soil.strain etc....
take it easy