WXSTXD

@AutoCrazy, It looks like it was the mixing of the fertilizer. Mix 20ml Canna A in 500ml water together with 20ml Canna B = white fluffy stuff. The mix of 20ml Canna A and 500ml water directly into the bucket + then the mix of 20ml Canna B in 500ml water into the bucket = no white fluffy stuff.

@WXSTXD, just keep an eye on your roots. As long as they look nice and healthy you should be ok.