Kelp or Seaweed for young plants?

I want to use kelp on my new young plants, should I? Also I will use rain water or Zephyrhills spring water. Is that good? Is ph really that important? What’s a good digital tester?

Bio squid does excellent don’t put it sit though, shit stinks lol

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pH is incredibly important @careg I recommend a nice $20-30 one on Amazon, you’ll be very happy you got one!

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Alright I will get one! Not sure if hydro store has the squid but I will check.