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I definitely cant return the pacu I had it for way to long and the filters I don't think I can return either as I had them for some weeks now but the best thing I can probably do is try to sell them off to someone..... and I have been doing water changes everyday when I Get home from work and I been adding the prime and stability ill do everything again once I get home and run the test again and let you guys see the resultsreturn the pacu and the filters and get better filters if you want any chance of keeping those fish alive. The pacu will get way too big for that tank. If your stuck on power filters I would suggest 2 ac110s. Not saying this to be rude or mean, I've been in your shoes. Bought my first tank, a way undersized filter, deco, bunch of fish. Put it all together and got dead fish, got more fish and followed directions on filter to replace the bio media and got more dead fish. Started to talk to people that knew something and got better. Do the right thing and return the pacu please. There are stickies in this sub forum dealing with how to cycle and what to look for.