Plain old goldfish are so boring and dumb looking in my opinion if you are going freshwater you build you own pond with some coy. Coy have much more personality and can live for a very long time. If you dont have room for coy get some puffers or something.

 

Wow that's a lot of info

So when your speaking about the filters, does that mean that your using them in one of those sump thingies where water is pumped out of the tank and into a secondary tank? How do those systems work? What size "secondary tank" would you need for a large tank?

Thanks

 

You mean Koi?