I finally decided to put together a 40 gal sump for my 100 gallon tank. What is the best media to put inside the sump, I'm pretty new to this so all I know is you need bio balls and sponges lol. Please give me some advice.
thepresence;3858137; said:You just need a first stage of mechanical filtration. I use filter socks. 2nd stage is biological. Scrubbies are the best as they are cheap and contain more surface area then bio balls. And they if you want, a thrid mechanical filter such as a sponge. Keep it simple.
