More than just gph but also layout but for comparison on my 145g have a Dart on a OM-4Way (3600gph less CL loss which don't expect much) and ~1000gph return from the sump. Lot's of SPS growth and sheltered areas so as good on the LPS. Had a crash but really don't think due flow, my signature gives an idea of tank load.
what's your flow thread