Argh! treatment this, treatment that, if changing less than 45-50% of the water, no dechlor is necessary, matter of fact, I change abou 1/3 of my tanks 40% daily(discus), and the other 2/3 40% every week(everything but discus), and I have saved a LOT of money by not even using dechlor. The ONLY water I dechlorinate is what goes into the tanks of newly hatched fry, just as a precaution, as they are more highly succeptible to chemicals and changes in water chemistry. I would LOVE to have the money that companies like hagen and tetra have raked in by selling stuff like STRESS COAT, that does nothing but neutralize chlorine/chloramine, and the stuff is so overused and wasted.. but I understand you people just love your pets, as do I, but so do the freaks who buy dogs sweaters and water purifiers....