Oh yes. The barbels are twice as long as the body when outstretched horizontally. And if the fish touches glass with both simultaneously they feel crowded and need to escape. So with that calculation at 12" it can touch both sides.
*****That's right.
But with the driftwood and caves that they require to hide in there is only about 4" on each side. So technically a 2" specimen is too big for the 180 gal tank.
*****I didn't get that. The fish has to touch front and back panels of the tank to feel trapped, out where it thinks it should be in the "open water." Touching caves or wood doesn't count. It is not open water.
Well I could seriously just cuss at these lfs's that say 16" in captivity. I'm quite upset. This was supposed to be the smaller alternative to my childhood dream to have an id shark or a tiger shovel nose.
*****The farm cull TSNs we have in the hobby require about the same minimum size tank as achara.
Well there is only one solution to this...
Take my wife out for a nice steak dinner and walk in the wilderness to break the news to her that we are going to need to do the basement renovation sooner than later so we can make our laundry room into a fish tank wall
*****Haha... If you get a 500 gal 8'x4'x2', that would be an adequate minimum for an adult. There are also plastic tubs, stock tanks, etc. that can be used. After all, a 350 gal is not as bad because most keepers I've rescued these catfish from kept them in like a 90 gal, while the fish was 2' and quite skittish.