Five years ago I got 4 Sailfin Marbled Pims, aka Leiarius pictus, at ~8" from snookn21. They did well in a 120 gal and then went into a 1500 in-ground concrete pond for 2-3 years. One was lost early on, I only presume to a predatory attack because I've never found it. Quite possibly it was one of my jau catfish.
Two years ago the trio went into one of the 4500 gal, where I could finally observe them conveniently and consistently.
They hit about 2' in about one year and then screeched to an almost complete stop, perhaps gaining 1"-2" every following year.
Just like their cousins Marbled Pims, they are utterly non-predatory. They have been housed with fish they could swallow and barely notice, like 3" koi, for 4-5 years and have never done it. They prefer pellets strongly to frozen-thawed marine baitfish I feed the tank. They appear to take the baitfish only after a fast and when given no other option.
Their interaction is confined to themselves, they don't seem to interact much with other tank mates, of which there is a hundred of very diverse fish. During the first half a year, the biggest one (by maybe an inch or two) was dominating. Then in the summer time, unexpectedly the smallest one took over its spot and held on to it for a long time. Nowadays, I don't know anymore. They are getting hard to tell apart too, which is not helping.
When the dominance is challenged, their fighting can get a bit rigorous with body slamming and pushing, poking, and scratching each other with their pectoral spines, which leaves deep white (no red) grooves. This I have seen 2-3 times in 2 years. Their dorsal fins often get tattered too but the tails and other fins are usually intact. The enforcement is manifested in the chasing around the tank and an occasional getting a hold of a dorsal fin.
Meanwhile, here is a video featuring two of my pictus (the third one decided to keep its mugshot off the world wide web):
Here are some photos of the current trio:
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Here is a smaller one, 1.5', from my prior life in Rochester, NY. Got this one from George Fear personally (Shark Aquarium) back in 2010.
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Here is my first ever one, the bigger one from Rochester, NY, 2'+ in 4000 gal pond, 40'x6'x2.5'. Got it from Pets Plus in Lockport, NY in 2009. Lost both during my move to FL.
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