This is scomb learning day for me. I put my 2 new 4" scombs in a 20gal tank with a small bicker and a 4" tiger sn. Other threads say they need a big tank with lots of current. Mine are hanging out on top of a piece of drift wood looking at the water outlets of my canister filter discharge. This would tell me they like a lot of water flow. I'm hoping they will be ok through the rest of the week end. I have a 120gal tank with no fish in it yet, but it's not quite ready for fish. My 240gal has 2-5" peacock bass, 2 marble cats that I'm worried would eat them. Do they jump? My 120gal tank doesn't have any lids.