Also I’ve been doing research on this too and it says that they can often be found in undisturbed stagnant water and that most tetras in general are often found in habitats (such as blackwater) were oxygen levels are usually lowyoure gonna have to oxygenate manually probably at least daily water changes, until you put a filter on or at the very least toss an air stone in, probably do a google search for low oxygen in aquariums so you know what the warning signs are