Four?
By cycled media I mean..charcoal and filter floss encased in a plastic cartridge or a plastic frame that has the filter floss material on the outside and charcoal is on the inside.
The media has been used on a established tank.
Some people throw their cycled media away....
I keep mine so that I can setup tanks without waiting to grow beneficial bacteria.
Your pics are spectacular!!!!.
This is the first time I have seen pics with a high magnification.
Can you add the pics to a photo album on this forum?