75 gal big enough for two sharks?

I'd like to add an albino red tailed shark to my 75 gal planted tank. It is
a happy little community with heaps of fish and no problems. I already have
a red tailed shark about 3" long in the tank. What are my chances of adding
an albino without disturbing the peace? Would prefer info from people who
have actually tried the two types together, rather than just hearsay
evidence. Thanks.