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I've been measuring the ph at least once a day, it has been between 5.5 and 5.75 for the past 4 days (they have been in the tent for 8 days now). I have never measured it above 6.25, and that was only after the first day. Do you think there is a problem with my ph strips?

I am new to growing, and this forum in particular has been a great help to me so far. So I'm finally posting my own pics, and hopefully someone can give me some pointers on what is going on. I've attached a couple of pics of my set up, but I think this one below best shows off the problem...