| Re: Some good tips on keeping goldfish |
Subject: Re: Some good tips on keeping goldfish by Goldy on 28/7/2008 18:39:37 As the others have stated depends on the brand, I use Rena bio-chem zorb in my tank and this states 2-3 months  where as the API one states 3-6 months, see link below http://www.petsparade.co.uk/aquarium/filter-media/?p=4529 |