First time seeing someone use clay pots as biomedia. Looks like the painted terra cotta pots block a lot of pores/surface area. Lava rock at home depot or Lowes or any hardware store might work out better and it's cheap too. Then again pot/shower scrubbies or sponges could be used as well.
Planning on any fish or just the plants?
What's the bungee cord thing for? To hold up a light?
Just hope the stand will last. If the shelves are particle board and get wet often, they will start to sag and create torque on the tank corners or just give out all together. Doesn't look like the shelving has framed supports (just resting in corners/legs), but that weight isn't too heavy and most shelves should be able to support that weight.