Cali Kid Corals

dumb idiot plumbing question

Hi all,
I'm an idiot to plumbing, I got a quick question, I have this tank from previous owner, the water return pipe is using a bulkhead and some pvc pipe on the outside, but on the inside of the tank, the bulkhead is missing a L shape pipe I think to the tank, so now the water from the return bulkhead is hitting the tank water and quite noisy. Does anyone know what i can do ? I went to home depot and looks like the smallest pvc pipe is 1/2 inch. but it doesn't really fit

here's some picture
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