My seahorse tank is a 90g divided into half with a glass partition. The clean water from the sump goes into my wife's reef tank first, then overflows into the seahorse refugium before going down the black overflow box. No bubbles. Maybe try putting a small clear box or eggcrate container filled with chaeto in front of the filter overflow to act as a bubble trap. They make bubbletrap boxes for Remora skimmers.
HTH,
Anthony
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