So, to satisfy the freshwater members in this thread, yes the GKM's work very well in freshwater applications.
Increasing the flow and nutrient export is a major part of solving algae issues in our closed systems. It will remove the built up gunk in dead spots that is decomposing. Large water changes with ro/di water, which is very important in saltwater compared to freshwater, is a great way of solving algae issues in our closed systems. It is very easy to do in our smaller systems and can be used as a way of avoiding purchase of expensive equipment to export nutrients...if only saltwater had those moss balls like freshwater does!
A clean up crew is an important part of our closed systems. Even though important, they aren't a solution to major algae issues as what is in the water column will still be there...so water changes!
As for vibrant, there is no need to dose anything in this hobby that isn't needed. I won't suggest dosing anything into your tank that you can not test for. Such products will also interfere with protein skimmers working effectively, if at all.
But with that said, looking at the picture this algae 'issue' isn't all over the tank. It is contained in a small area, possibly from it being introduced with the zoe frag. It is possible that you can remove the frag and simply scrub the algae away...but if there are excess nutrients in the water column the algae will simply return and continue to grow.
Hope this helps with your issue!