04-15-2014, 07:20 PM
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When you say 'normal', what numbers were you getting? What were you using to test?
What fish are currently in your tank?
Was the tank cycled before you added fish, and how long has it been running?
I'm a bit concerned when you say 'product after product', as most chemicals marketed in stores really aren't helpful to most tanks, and in fact can be damaging and make issue worse.
As to the pleco...I hate to be the bearer of bad news, but a common pleco will easily outgrow a 55 gallon tank, and they have an extreme bioload. Their bioload is part of the reason many experienced goldfish keepers won't keep them with their goldies, as goldies already produce a lot of waste, and a pleco just compounds that issue.
I'd really like to work out the issues you're having currently with you, before we move on to discussing goldfish, just to ensure a safe environment.