Hey gang, first time using fabric pots but is white substance around bottom of pot any thing to worry about? I have been guilty of overwatering this grow and trying to be proactive on any additional issues. The white substance rubs off easily and have not seen any on plants (yet). Is this normal for fabric pots to stain like this or could it be something else? Have been running rh in the low 60's during veg and now running in mid 40's during stretch, but have been drowning the ladies...