Looks to me like the bottom half plumbing needs to changed too..... The primary drain in a herbie should be plumbed below the water level in the sump.....I would also consider removing the egg crate and the bio-ball box that is in that drain chamber....you don't need it there

with the old tank having a DSB I made boxes out eggcrate for the LR to sit on. As the LR was being placed before the sand, reasoning was "why bury the LR in 4" of sand'. Current tank is BB, LR just sits directly on the glass.

Nice to see you've started with a Herbie.