as I only have plain gravel for a substrate (I had no intentions of plants to start with :lol: ) and I now have quite a few plants (hair grass, thin vall, golden penny wart?, anubias) that are struggling along I was wondering if it would help to put some expanded clay pellets ( used in hydroponics) in the substrate to hep improve the Cation Exchange Capacity of it? The tank has been operating for ~2yrs and Flourite etc is a bit out of my price range as I am only a student. help would be great
David
David