Please don’t add the fancy goldfish. They should never go in with tropicals. I use to breed black moor’s. As Retired Viking said, they need much cooler water. They will find tetras and other small fish as tasty snacks. Goldfish belong with goldfish. One correction I’d like to make to what @PheonixKingZ said, fancies need 20 gallons for first and 10 for each additional. I have 2 tanks specifically set up as goldfish tanks. They are beautiful all by themselves. I limited my 75G to 3 fancies as my black moor is now 8” long. Keep that in mind when stocking. They do get big.
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