Try 24" . Their maxillery barbel span is also longer than their body so that makes for the requirement of an even large tank, I'd say 96"x36" minimum for an adult.Vulture catfish are cool and stay smaller I think.
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+1 not too big for your tank...and really good lookingVulture catfish are cool and stay smaller I think.
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Planet catfish lists them as maxing out at 19.7 inches. I'd definitely recommend one mine is also going into my 300 when it gets some size. As of now it's 8-9 inches and really nice and eats like a pig really active too. Not a fan of catfish much but I really like himTry 24" . Their maxillery barbel span is also longer than their body so that makes for the requirement of an even large tank, I'd say 96"x36" minimum for an adult.
Hoplos are awesome. I had a group of 7 H. littorale for a few years. The original 3 were about 4 years old I think, they'd pretty well stopped growing (noticeably at least) around the 6-7" mark. Great fish though - very friendly, very active, very easy to take care of. The whole group would swarm my hand if I stuck it in there with food in it I really miss those guys!I'm a big fan of hoplos but they don't get very big. my fork tailed hoplo will max out at like 8-9" but other species are more around 5-6" max. they're like giant cory cats and very active so a school of big hoplos would look great in a tank that size i think. if those aren't your thing i saw others suggested sun catfish or lima shovelnose which are both very cool imo as well.
If you got a small lima he shouldn't eat your polypterus and can live in your tank. You could also look at raphael cats, pterodoras granulosus, and Megalodoras uranoscopus. For cichlids you could get oscars.Lima shovelnose top out at 18 inches