@Jonkomaster,Yes, PH from 6 to 6.5 in one day is ok. I used to have wild PH swings, from 5.5 to 6.8 in 6 hours. If your water temps are over 16C, you must use Hydroguard or other beneficial bacteria to avoid getting pythium or root rot. I had huge problems with pythium because of the high water temps. The dust from the clay pebbles is fine, it won't affect your plants.
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