Yes, goldfish can eat cichlid pellets in the short run. It poses no immediate harm. However, don’t make it a habit. Goldfish and cichlids have somewhat differentiated nutritional requirements and metabolism. Therefore, it’s best to stick to food formulated especially for goldfish.
Goldfish are natives of East Asia, while Guppies are from the Caribbean...
Yes, goldfish can regrow its scales that have been infected or hurt during accidents or in fights with other fishes. In fact, the scales regrow fast if the wound is not too deep, and if they are young, it regrows even quicker.