This really depends on the species, but you need to identify the species. Xanthism, which makes the golden archer gold, tends to wipe out other markers that help identify them. Count the dorsal spines. If there are four it is T. jaculatrix. It requires approximate SG 1.010. If it has five spines, it is probably T. chatareus, T. oligolepis, or T. microlepis. If it has more than 30 scales in a longitudinal series, you can rule out T. oligolepis. If it has more less than 30 scales in in a longitudinal series, you can rule out T. microlepis. Due to xanthism, T. chatareus would be difficult for me to id. I would nearly wager that these are neither T. blythi or T. lorenzi. T. chatareus prefers ~SG 1.010. T. microlepis and T. oligolepis prefer 1.005. These two are also found in freshwater, but seem to enjoy the brackish waters. My archers, T. chatareus, were kept in freshwater by the vendor and arrived with fungus on the fins and they were dark with irritation. Being euryhaline, I immediately increased their holding tank water to SG 1.005 and then much slower, but still with haste, I continued to raise to 1.010. The fungus disappeared in three days, and the archers irritations subsided. Long story, but I believe if it needs a certain condition, so it should be kept. That being said, most archers swim freely between fresh, brackish & marine waters. Though, they most definitely wouldn't live their fullest in soft, acidic water.
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