For fish, either could likely work though a damsel may be pushing it aggressive wise and just be sure if adult size as many damsels can grow fairly large.
As for HOB skimmers, I have a Biocube skimmer (very finicky) and I have an in sump Reef Octopus. For your tank, I’d possibly look at a Tunze Nano (it’s an in tank skimmer though) or maybe an IM NuvoSkim Desktop (appears to be internal as well)
As for HOB skimmers, I have a Biocube skimmer (very finicky) and I have an in sump Reef Octopus. For your tank, I’d possibly look at a Tunze Nano (it’s an in tank skimmer though) or maybe an IM NuvoSkim Desktop (appears to be internal as well)