Assertion: hornwort | /r/CapableOf | tolerate a hardness of 5 to 15 dh.
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Source sentences:
text: pH can be maintained from 6.0 to 7.5, while hornwort can tolerate a hardness of 5 to 15 dH. Make sure you maintain a good filter – although hornwort acts as a fantastic filter on its own, you also want to try to keep nitrogen components (like nitrites, nitrates, and ammonia) low.