What size tank ? 150 plus?
Im hoping its huuuuge lolI was thinking a small re-purposed swimming pool??
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if it's a fancy goldfish they like water temperatures from 68-72 F. Fancy goldfish in water that is 55 degrees Fahrenheit*and lower are almost catatonic.
As long as the fish isn't small enough for the goldfish to eat and it is suitable for that kinda temperature it should be good. But also don't Foget fancy goldfish are slow swimmers.
And your going to need a big tank cause most fancy goldfish reach 6-7 inches.
Your iridescent sharks can grow up to 10 inch
Your Bala sharks can grow up to 13 inch
Your pleco can grow up to 12 inch
I don't know how many of each you have but 75 gallon is not big enough.
Goldfish get very big and are very dirty fish
1 fish oer 10gals
They eat everything
Try boiled peeled peas they are best
Good point, goldfish eat anything
And if living space is cramped, they'll eat tankmates to solve the problem
They are social though, and not automatically aggressive