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lol don't worry, I don't buy on amazon...I'm from Argentina.
And Yeah PH is hard. Your tap water is really bad man!
I know that there are test strips that are sold in aquariums but I don't know how effective they are.
I understood about the mulch,
I'll try a thinner layer then. You have a good eye, as the mulch I put on them is quite thick.
Thanks man!