i just picked up some stress coat by api. it can be found on this page -http://aquariumpharm.com/en_us/productCategory.asp?categoryname=WaterConditioners. i was told to use this to dechlorinate the tap water. it says use when doing a water change. well the directions say 5 ml per 10 gal. so i have a 10 gal tank. i used 5 ml like recomended. now i want to do a 25% water change. thats 2.5 gallons. Am i supposed to add the tap water, then dump in 5ml of the stress coat? or should i be using 25% of the dosage? 25% of 5 ml would be 1.25 ml.