I was wondering what the white chalky residue on my hydyoton is? I assume it may be salts. I am using GH flora grow ,GH flora bloom and GH micro 2.5 ml per gallon in the seedling stage. Is this residue harmfull? My babys look healthy but concerned that this may change PH is maintained at 5.8. I started with distilled water therefore there should not be salts. Need some experts to comment please.yea bra!!