What type of CoCo are you using?

3% hydrogen peroxide at a ratio of 3:1 water/peroxide will kill mold (fungus/microbes) on contact. You can soak roots in this concentrated solution for about an hour. After, you can use 2-3 tsp per gallon of 3% peroxide at anytime without harming microbe populations. The reaction is what is harmful to microbes. You can prevent any possible harm…

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This plant is needing more food. It’s currently being underfed.

Leaf deformities are typically caused by stressed/damaged roots from pH and/or over/under-watering. This is assuming it’s not some form of variegation.