Uh oh...is this the first time fish keeping for you?
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Op, your prior fish I doubt died from lack of oxygen...rather I think they died from ammonia. Basically a brand new tank is not good for aros. You need to have a mature filter to keep aros...to get a mature filter, you have to keep smaller fish there so proper good bacteria can grow to take care of the waste aro is going to generate.
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Uh oh...is this the first time fish keeping for you?
Sent from my iPhone using MonsterAquariaNetwork app