What is this on my clay pebbles

Is this a mold or fungus on my clay pebbles? Is there something i can treat it with? Or should i leave it alone? Could it be nutrient?? Thanks for any help.

1 Like

Looks like mold to me but a possibility it is dried calcium. Have you given any calcium / cal/mag / lime nutrients or Mg (to strong - it is a salt)?
If mold, you gotta clean you clay. Are you straight clay medium or a mixture under there?
Hows - air flow, humidity, ph, tds/ex levels and what are you feeding and how often. What is your temps in there

1 Like

Must be mold. Humidity is 33% temps range from 72 to 75. Ph is 6.5 and I am using all clay pebbles except for the rockwool seed starters in the middle. I dont think i have calcium because i am using distilled water and a very low nutrient level. I guess i will be cleaning some clay. Any suggestions how to do that?

1 Like

33% humidity is really not a number that I would suspect mold growth. Are these a recently purchase, a reuse from a previous grow, from someone else…Mold is something that takes your plants OUT, not down, OUT. NO MOLD unless you want sickness.
I used to recycle them like this: H202 (3% peroxide bath), bleach bath (tblspn per gal water). Apple Cider vinegar was (Standing water and or constantly wet hydroton can support mold growth but most molds don’t like alkaline ph levels and flourish close to 7 ph) Then boil in clean water then bake at 500F.
Problem can be - mold is in the plant or room and fan is spreading it. Mold gets inside the clay and is very very difficult to get out as the passageways are microscopic. Consider NEW Hydroton pellets or a dry top layer. Yoy clay may just be wet too often and doesn’t dry

I would say Nutes with 33% RH

These are seedlings, you do not feed them any nutes until they start getting ti the 4/5th node.

1 Like

Never planted in that medium before .
Whats the benefits to using clay pebbles over soil

They are used in Hydro type setups. You water couple / 3 times a day. Higher oxygenation, more nutrients right to the plant,bigger, faster, more potent (to a point) growth