Which pump for my 190g?

[SeaHorse_Fanatic]

Look at what flow rate you want or your overflow/plumbing can handle. Remember to use the gph minus head loss (loss of flow due to the height the water must be pumped up to get back into your tank).

You also have to decide whether to go with in-sump return pump (like a Mag or Quiet One) or an external pump (Mak4, Sequence, etc.)

Anthony