I use one on my 100 gallon. Fx5 filter, the two way nozzle it came with created some weird flow pattern/ with the spray bar I could get deeper into the tank to create a natural flow back to the intake nothing settles in the corners now and when i vac its just around the intake. Not mandatory to have in my opinion but it did improve my flow around my plants.
29g Tetra Tank
100g Planted Angel/Clown Loach
I can't spell...Im an engineer, I do math