That sounds like a better set up for him. They usually enjoy shallow, long tanks to tall tanks. The ridiculous fins they've been bred to have and all
Hillstreams come from fast moving water with strong currents, hence the name. Also a lot of dissolved oxygen in the water and I can't remember but perhaps
I think it's the co2 diffuser on the left side of the glass.
(nice setup by the way)
Sitting ducks even...
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Otos might become sitting sucks for a puffer to harass. The kuhlis might also if not given enough hiding room, but even so, sometimes mine just like to