Ok, so you have a sump. That is good! Forget a canister filter at all. The sump is your glorified canister filter. Is there anything like live rock in your sump?
Now, does your sump have baffles? Are you using anything for mechanical filtration like filter pads or filter socks? Baffles and mechanical filtration will really aid in the removal of floating particles and air bubbles. Your skimmer outlet could be producing bubbles as well, so a good set of bubble trap-baffles before your return section will get rid of most bubbles. You could also have a small air leak in your return plumbing.
Hopefully the new reactor they send you will work. They are beneficial for sure. The carbon should clear up your water, and the GFO should get those phosphates down.
If you want to run carbon and GFO for now, you can put them in some media bags, and run them through a hang on filter, that would work just fine for now.
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