
I have just bought a new big tank, 72" x 21"D x 18"H. I have bristlenoses currently but when I get the big one set up, I would like to change to a single larger type.
The tank will be unheated most of the year (heater for winter to keep it stable but that's it) and the temp stays at 21-22C.
Can anyone suggest a species that could live happily at that temp and not outgrow the tank? I imagine up to about a foot long would be ok. Tankmates will be smallish barbs (golds, arulius, rhombos) and spotted hoplos and the setup is amazon biotope type thing - no live plants, lots of wood/branches and some rocks and slate, and sand as the substrate.
Thanks!