If you mix an organic fertilizer like an Espoma Tone into your potting up mix and store it under low light conditions you are going to get some saprophytic mold growing on it. Even under the lights you'll get some especially if the soil is shaded by the plant canopy. It's perfectly harmless to your plants. The fungi are just decomposers of the dead organic material. Once they are outside in the sun the mold will disappear.
That's probably the best remedy for your plant overall, get them outside and start hardening them off.
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