Howdy,
as rallysman said: Check your tap water. EPA allows 44 ppm max. Or do you get your water from a well? That is not regulated by EPA.
Do water changes.
And get some fast-growing plants, e.g. floating plants.
The nitrate levels are sure not in the healthy range. Yes, long-term, I'd say I'd be somewhat concerned about your fishes' health.
HarleyK
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