Is The stuff you get from the pet store any good? I bought a bottle of Ph down safe for fish and plants. mix 1ml to 10 us gal. So mix'd 1/2 ml to 5 gal. no change, Up to 9 ml, 1/2 ml at a time, maybe drop Ph. by a point, started at 7.4 now 6.4 That's where I want to be. Is it still safe to use? Thanks.
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