The UK Growers Thread!

Quick question, my pH in 400ltr tank has fallen from 5.9 to 3 in 2 days ! I think it's coz they are exploding + roots r acidifying the water , should I add more feed to bring back up ? , any help fellas ?
 
Afternoon cock gobblers.
I'm out doing a 3 hour charity event today, can't be arsed but I've made a good bit in sponsorship so I can't back out now.
 
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