So i have just updated to a superfish QubiQ 30 LED i really like the tank and cant get any bigger due to where its located. This is my first planted tank. My question is what should i use in the filter media. The filter is built into the corner and currently has foam sponge, then a carbon zeolite mix and then some fine floss. I was thinking of removing the carbon zeolite and replacing with some form of bio media, althought the space isint that big, any suggestions appreciated.