Mixed Grow

From seed five days is not unusual. Time is given as 3-7 days in most sources. And that is just to sprout. I would be careful with the nuets at this stage, 25% of the low dose would not be out of line. Kill the cal-mag for now or cut that dose it does add some nitrogen which can be dangerous to seedling if too much used. Good luck feel free to msg any time.

I sprout in rockwool as well, in the exact same manner as you I figure. I experienced slow growth myself too this time for the first week, but soon found it was from running my brand new lights at half watts (veg only state). So it made me wonder: If you haven't seen so slow growth before, then you should probably also consider other factors like the light, temps, feeding or something entirely third. That is, if you are doing something else off perhaps. Good luck with it.

have you fed them yet? as soon as a seedling opens its first set of leaves it needs feeding it can take 3/4 strength straight away 2 days later up to full strength i always use rockwool just the inch block never have a problem on a bubbler you will need to hand water to get the roots down your first leaves will probaly brown out cos u havent fed them but dont worry