Within 48 hours I had a complete wipeout except for my starfish. I have a 300 gal
tank with a u /v, protein skimmer. I also have an r/o system, and chemi- pure
I brought a sample of water into all fish and results were perfect except. For nitrates which were 60.
I waited 4 weeks then added 3 new fish and they all died within 2 days
Any help would be greatly appreciated