Could you possibly wrap the outlet of the skimmer with some fabric, filter floss or a cut out filter sock (where the bottom is cut out) ? This acts as a muffler and helps to direct the outlet water down into the sump water more gently. Just make sure the muffler is submerged in the water. A lot of skimmers come with mufflers like the Hydor brand of skimmers. I used to have one and ya, without that muffler it was very noisy. With the muffler it was dead silent. The thicker the muffler the quieter it'll be :-D
K.
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