I personally like discus and would turn any tank into a discus tank. But, I've always like the look of arawanas and arapaimas. There's a lot of people that like rtc. You could work-in something like that.
Yep not wanting any tetras Mike lol
I'm actually starting to think about doing a low tech planted tank with a full "carpet", something ive done before on a much smaller scale. Thinking about getting boeseman rainbowfish for it.
Heres whats done so far.
The rack with the 3x10gals cycling.
And heres the 65gal I put together
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x2 on a bichir, a senegel would be very happy imo in a set-up like that. sound slike your a tera guy so a bichir would be very different for you. otehrwise a rainbow tank is always a show stopper. I miss my sens as they where very active and interactive fish... whenever they thought they could beg food from me they would!
I'd go with the arapaima, arowana, and RTC idea. You've got plenty of room IMO. And use one of the 10's to grow out a gator gar so he doesn't get eaten.
Background is painted waiting for it to dry, I'll be putting it in the rack later today and filling the tank up tomorrow for a leak test. Got 2 hobs filtering on another tank in preparation, seeded them so won't be long till I put some fish in.