That "sump" you have there is considered a "wet/dry" as the bio balls are partially exposed and water trickles over them, keeping them wet, but not submerged. I would remove that crushed coral substrate under the bio balls and rinse the bio balls very well if you intend to use that setup.
Those filters are very good at converting ammonia into nitrites, and then nitrites into nitrates, but that's where filtration ends with that wet/dry. You'll have a hard time keeping the nitrate levels low with it. I would also suggest a new sump. Something partitioned and large enough to hold a decent protein skimmer.