This is a rheophillic species, coming from highly oxygenated briskly moving waters.
If it were me, its tank would have a strong power head pushing a current along the length of the back wall of the tank, and if the pump had a venturi option, I'd make use of it.
The front of the tank providing a slow current area.
And although they are said to come from various water parameters, the area of S. America they come from has basically very soft, seasonally low pH water.
Again, if it were me, I'd dilute tap water, with either RO/DI or rain water.
Your pH suggests high mineral content, hard water which may be counter to their needs.
The shots below are in long tank with strong current along the back wall, and venturi valve producing lots of turbulence, and in turn high oxygen levels
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Below a power head with built in venturi option.
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