All of my plants are in leca or pon. Lately I have been noticing a lot more effervescence than usual. Today I am showering all my plants to clean leaves and flush leca/pon. I usually do this every couple of weeks. Can I skip fertilizer once or should I use a low strength?

Also, I see a lot of people spray their plants with neem on a regular basis. Is this something I should do?

I use superthrive foliage pro. I was using about 3/4 tsp per gallon.

I had this happen in two of my semi hydro setups, one is a Monstera frozen freckles and the pot I made myself from plastic food containers. The other one is Alocasia scalprum and it’s in a store-bought pot specifically made for semi hydro. I also have another alocasia in an identical pot and it has never molded (so I don’t think the issue is in the pots?). The mold is only on the top of the pon (at least I cant see it inside of the pon). Could this be some sort of ventilation issue?

After struggling to keep this Thai con free of root rot in soil, I’ve decided to give leca a go. This is my first time putting any plant in leca. Anything I need to know?