Sorry for not being clear about th 75. The 75 is not running and empty, I can set it up right away with many sponge filters and bio balls from my 240 plus bio spira to get it running.
I know what my TSN does, he usually started swimming vertically against the glass to "hunt" onc I turn the lights off...
I always mix variety of diets with food. Krill, MP, Beef Heart, stix, massivore pellets, bloodworms, live blackworms, cricket and etc.
PS: I watched the recording from my camcorder last night and he was pretty much left alone all night. I'll try again this afternoon when I turn the light off