Hard water + marks on leaves

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Hi,

I started a grow recently and the soil is covered in what I think is limescale deposit (not sure if that's the right term) and I noticed some very small marks on leaves. What can I do to fix the water issue ? Would filter carafe be ok ? And would that issue be linked with the marks ? These are very small but on all three plants so I don't know if it's important or not.

Some context :

- 11l/3g plastic pots
- I watered 2.5l/0.7g when planting the seeds 14 days ago and 1l/0.25g 4 days ago (which was likely too much because I have moss too) with very small watering in between with a spray bottle
- No nutes, only Biobizz PH down
- Temps are roughly 21°-25°C/70-77°F and humidity 50%-68%
- Soil is Biobizz Lightmix

Soil with white deposit and moss
small light green marks on the inner parts of the leaves

small light green marks on the inner parts of the leaves, second plant
small light green marks on the inner parts of the leaves, third plant


Plant on the second pic was falling a bit so I added soil to lift her up which is why there's no white deposit. I'm not sure if this belong here or in the new grower section since it's a bit of both.

Thanks !
 
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