My goldfish Tank

You need to upgrade your filters, do some more water changes and lessen the amount of goldfish in that tank, that water is very murky. You do know that koi get 2-3 FEET long?
 
Might want to grab up some algae pellets for that pleco too.
 
Cute GF........:)
 
In the third pic it looks like the tank isn't being supported on the side, this is a disaster waiting to happen. Your tank needs to be supported on all four sides or you will end up with a lot of water on your floor.
 
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