I have a new 250L tank which I will soon be setting up. How do you folks calculate exactly how much decholrinator to add? Obviously I will want to fill it with the hosepipe as it would take me a month of sundays to do it by the bucketload whereby I could measure it correctly. Although the shop says its 250L I am worried that if I dont add enough dechlorinator it will kill off the bacteria in my seeded filter?







