I know, it's 36x18x20 - which is approx 56 gallons. (not 65 like you keep saying)
Either way it's FAR too small for an adult Pearsei.
As far as your 75 gallon tank, it's already overstocked. (14" oscar, 10" catfish, and a 14" pleco) ...... and now you want to add a Pearsei? WTF is wrong with you?