6. 7 if you do biweekly water changes with no tankmates.
While this guideline is ok, just please don't house any grown discus in a 10gal or 2 discus in a 20gal10g per adult discus general guideline.
This is a solid w/c schedule!I do 25% WC daily with 70-75% WC twice a week.
While this guideline is ok, just please don't house any grown discus in a 10gal or 2 discus in a 20galA single discus should be housed in nothing less than a 55gal...at a minimal