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Sounds like your tank isn’t cycled.
Need to establish a colony of beneficial bacteria otherwise it’s not going to be a healthy place for anything to live in.
Google tank cycling and nitrogen cycle.
It usually takes about a month+ for a tank to cycle. You can get a head start by using an old filter from an established tank or some gravel that will already have the bacteria present but you might introduce diseases or something you don’t want.
Dogtemple
Yes I think that is a consideration