I see CAVIATION happening with using a short 90 fitting on the suction of pump, is ok if on the pressure side of pump to use. if can use a long swept elbow
or slow down pump RPM till bubbles disappear
if was me I'd have just clear rez tube exposed outside of case with fill top and make a new plug with a ring on it so that can have a helium balloon of a pig hook to ring floating above your master piece
Note would make clear tube longer, thicker and have inlet on side of tube, so that would use 2 45 angles for from top view alinement is offset to keep pump location as is or use soft tubing
to pump suction also this allows self burping fluid level above loop and plug current inlet
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