Tracey2, not sure what you mean by "they have been acclimatizing for 4 hours now and are now at .21"? But I agree, just get a bottle of r/o water from the grocery store or Lowe's and adjust your QT tank down to .018-.021. LFSs and DD typically keep their s.g. on the low side as this is less stressful for the fish, i.e., at a lower s.g., the fish do not need to consume so much water to prevent dehydration.