Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
There might be too great an emphasis on bio-media, not enough room for sponges, floss etc.
On a non-planted tank you would need lots of high quality bio-media, highly oxygenated and so on. But on a planted tank the plants are so much of the bio filtration that you can dedicate more space to mechanical and chemical media. The bacteria will live on these things, too, of course.
In your drawings and in the picture in post #12 there are large volumes that could be arranged just a bit differently.
Use the upper half for bio media, but under that set up the first of the mechanical media, a coarse sponge. Or use poret or matala mat style bio media which is also like a coarse sponge, the first in line of mechanical media.
I think I would make the two small chambers in the middle of your system a bit taller. More room for more media, again.