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Sand or Gravel substrate for discus and cycling
Hi all and good morning,

I'm looking at keeping 5 discus In my Juwel Lido 200L tank and some other companions? (2 or 3 Cori's and 12 Cadrinal tetras?). I've currently got two guppies and two tetras to help me cycle the tank (with me monitoring the tank closley) - Added some quick start and let the tank sit for 1 week before adding them.

Big question is substrate. The tank hasn't cycled yet (0.25 ish nitrite, 0 amonia and between 10/20 nitrate) - Doing daily water changes to help get this down to 0, did two 30% water changes in the last two days and has made no difference. Obviously i won't be adding any discus until my tank has cycled and stable.
I decided to remove half my gravel from my tank yesterday to help lower my ph, which it did now at 7.4 from 8.0 (7.2 straight out the tap)

Is the gravel im using ok for discus? I can remove more if needs be or replace and get sand?

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