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Planted tank with discus, what soil to use to keep pH levels ideal

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In my opinion Discus (like other South American cichlids) are a soft water fish

pH whilst easy to measure is somewhat irrelevant

If keep in a heavily planted tank the pH will swing....particularly if you add co2

Plants take up co2 during the day and give it off o2 wihich reverses at night

i.e. low pH in am and higher just before lights off

In my experience with soft water fish....focus on the hardness of their water(add rainwater/RO water)

don't focus on pH....and understand that chasing a constant pH isn't needed for fish health

Water should have a low conductivity/TDS.....

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