I bought some carbon mixes with Zeolite crystals and I wanted to know if I can use it in my Rena X4? I have 1 spotted gar and 2 Atf's. Is this media o.k for fish? I need to change the carbon in my Rena so I wanted to know if I can fill all 4 cages in the Rena with this media also. Right now its just loaded with carbon and spunges. You think if I do this media it will not have an effect on my Vittatus or gar?
http://www.petco.com/product/100374/...-Crystals.aspx
http://www.petco.com/product/100374/...-Crystals.aspx