Pros and cons of using peat in aquariums with forum and a …
As it has been mentioned above, from JBL and Sera are recommended and in such a case it can be an amount of 250 grams (8.81 ounces) per 250 litres (~ 66 US gallons, 55 Imperial gallons) of water and a replacement of peat should be done once a month usually when cleaning filtration media and eventually pipes if using external filters.