All of my canisters are set up the same way; mechanical on top mechanical/ biological in the middle, and biological on bottom. No need to replace media
I love eco complete, in my opinion you can't beat it for a natural look--different sized grains throughout and doesn't cloud every time you touch it.
I am going to be starting another planted tank and what i am going to do is actually quite complex, and different from my other planted tanks. Not so
Mine was more of a sudden pouring out of water, definitely thinking it was from me messing something up when putting it back together after cleaning.