I have recently started up my first saltwater tank, its about 7 months old with livestock and corals. Currently (since i went the cheapest route possible for start up) all i have for filtration is a HOB filter. All equipment is in the tank, and im considering 2 options... #1 is to setup a HOB refugium and protein skimmer, in hopes that this will help me make the tank more stable and reduce nitrate climbs... #2 is to lower the tank water and drill the tank/ add a sump... my question is which route should or shouldnt i take? i feel like a sump would give me more options down the road and increase my water volume, but its also riskier. Thoughts? Thanks in advanced!