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Can anyone offer me any advice on how to best to change my PH? I live in a hard water area and my nute mix is coming in at around 7.1. I've checked the soil and it seems to be around 6.8 so in the good range but don't want to ruin my hard work setting it up with the wrong PH nute water.

I've just upgraded my cupboard from a 250w to a 400w HPS (my buds were quite loose before and not particularly heavy so trying to change to a more intense light) only thing is where it's situated I really struggle to maintain a good level of temperature in there. I've got a fan to try and keep...