Hey Ferts,
Looking good mate. The white stuff on top of coco is salts, need to drench the coco to run off, let it drain.
Dont put pots in that container where the water will collect, coco sucks it up again.....all the salts...everything you just flushed out.
Seen heaps of people do it, me included.
Dont treat coco like soil, water at ph 5.5-5.8 and let it rise by itself, as it dries leaving it about 6-6.2...run off should be about 6.5+
Dont water until pot is half of weight wet, cant go wrong then.
First coco grow is always the hardest, once you dial it....your off and can get em up fast.
Have fun.