the hujeta gar grows extreeemely slow, even on pellets... but i would say maybe 55 gallons for a fully grown hujeta. they don't get much bigger then 11 inches in a tank you know... the needle nose i don't know anything about..
i just got my hujeta and hes amazing they eat a lot and they are great looking i think a 55g should be fine for a hujeta maybe a 75 would be better though