As i have said in a previous post im upsizing tanks, previously when doing a water change i used exactly the right amount of dechlorinator in a bucket of water and poured in tank. As my tank is far too big for this now im going to have to change my method and add from a hose. Ive had mixed reviews on adding dechlorinator tho some say use enough for water added to tank and some say for the whole tank capasity. Which is correct?