Removing hdri from actual scene while retaining lighting functionality

Hi, I am currently using an hdri that’s a blueprint with a sky sphere and sky material. I want to be able to utilize it as a light source but removing the actual hdri from being rendered in the world when played. I basically want the world to be a black background while giving off the same lighting features.

There are the reflections of the hdri on the ceiling and floor of the water material which i want to maintain in the scene while removing the actual emitting sphere part, making it totally black.

How may I achieve such an effect? With post-processing volume, perhaps? Using custom depth? Thanks in advance.