Yes, the purpose in your case for a wavemaker is to keep the detritus for settling. Also the fish might feel they are in a more natural environment with a ‘current’ to swim against.
Big tip, here; With the Marine Pute blocks, if at all possible, find a cheap plastic Tupperware type thing to set in your sump, and then set the blocks in them. This is because they ‘will’ disintegrate slightly (more if handled), and the plastic bin can catch all the very fine sugar like sand that will come off of them and then it won’t be all inside your sump. You might even want to try the MP balls if they fit better into something.