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regarding rainbow flavored candy, i tried fishing without using rod. the result: catfish, a fish that used for sub quest (idk what quest), ruby, and some equipment that can be sold for around 73.000...

from my experience, no. all i get are equipment, gold carp and diamond

So, it seems that using deluxe fishing rod and sharkbait for fishing almost guaranteed would give you an equipment that you can sell for 15000 cegel average (There's still small chance getting gold...