Definitely bare tank. Goldfish eats plants, swallow pebbles, and they have very high bioload.
You will need good filtration system, lots of regular water change, and some coral chips to buffer your water.
Before you buy your ranchus, go and find out what is a good type for ranchus, so you can avoid what not to get. I think you can stock 4 to 5 ranchus in your 4ft tank.
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