I have one, and he'll be a problem in time to come:
Auchenoglanis occidentalis.
he's now about 8" pushing hard, in the 130G.
but he'll be bigger, MUCH, much bigger......
And it's too bad I can't get a bigger house soon (houses are in very short supply in the Netherlands and incredably expensive: unaffordable for me), and thus, a big tank.
This monster would need a 400G or even more to live in.
but I sure will miss him when he's gone!