When the top of the soil is looking not wet, it has a lighter color. Always water so the leaves don't get wet, bottom watering is safest, but a carefully aimed spray bottle mist that just hits the soil and not the leaves may be used to do a small top watering. You can also feel the soil, insert your pinky finger to about half a fingernail depth, if it feels dry, then water, if moist leave it alone. Do not overwater, they will get starved of nutrients and you will get yellow leaves.
I find when they are tiny it can be 4-5 days between waterings, and daily when they are just about ready for final transplant.
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