Hi. That's odd that your goldfish kills the other fish. Are you sure it's not the fish dying and the goldfish nibbling on the dead body? I know of many goldfish tanks with plecos in them with no problems. You can't mix cold water and tropical species, so I know of no other fish you can put in your tank with goldfish.
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Phishie

"An ounce of prevention is worth a pound of cure."

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