Return pump

[reefer tjp1]

Does anyone know what is the biggest return pump the can fit in a waterbox cube 20 aio

 

[TX_REEF]

it appears the return pump interior dims are 3.1" × 4.6" according to waterbox website. You can do pump research based on that. I generally love to recommend reefbreeders return pumps which are powerful, run virtually silent and are quite affordable; you could fit the 600gph model in your system. Hygger also makes good pumps at a cheaper price point, but will not fit in your return chamber.

Reefbreeders nautilus DC600: https://reefbreeders.com/products/nautilus?variant=45370146881814
Hygger:

 

[reefer tjp1]

it appears the return pump interior dims are 3.1" × 4.6" according to waterbox website. You can do pump research based on that. I generally love to recommend reefbreeders return pumps which are powerful, run virtually silent and are quite affordable; you could fit the 600gph model in your system. Hygger also makes good pumps at a cheaper price point, but will not fit in your return chamber.

Reefbreeders nautilus DC600: https://reefbreeders.com/products/nautilus?variant=45370146881814
Hygger:

Thanks for the info