I have a question about wet/dry and sump. I have both and was planning to use them.. in the sump there will be a refugium and a protein skimmer. Is this overkill? It’s been awhile since I have done this, so be kind. 
It is a 125 gallon aquarium with 5 gallon wet/dry and 29 gallon sump.

It is a 125 gallon aquarium with 5 gallon wet/dry and 29 gallon sump.

