Looks like I have not worded it clearly. I've been seeing this fish and its RTC tank mate of the same size (who was killed by chlorinated water accident recently) for years. I've never seen them swim around "like subs". Always either sedentary on the bottom or vertically / semi-vertically against the front glass in one spot.
Hence, I used the word "prefers". Coupled with the prior sentence, it meant prefers "all the time", not "for this moment". You are right, it'd be utterly silly to generalize from one snapshot.
I am glad your 3'-ers are doing great in a less than 2000 gal. But IMHO, exceptions exist to any rule (of thumb or not) and they do not deny the rule.
What are the dimensions of your tank, Mayo? I've seen the photos and threads but do not recall the size.
Ahhh, sorry think i may have misunderstood you then
sad to hear 1 passed
as for mine i previously grew out in a 8x3x2.2 (LxWxH) glass tank but now they have a 8x5x2, 600gal at max level each, on the way is a 12x7x3 1887Gal in the hope i can house multiple together, id like to hear on other peoples experiences in housing multiple rtc's together