Ceviche with potatoes

1 3/4 lbs sea bass or 1 3/4 lbs flounder fillets 1 red onion , very finely sliced 1/2 red aji limo chile , chopped very fine 1/2 yellow aji limo chile ,[...]

7 ounces octopus, cooked shrimp , tails blanched 7 ounces scallops 1 red onion , sliced very fine 1/2 red aji limo chile , minced 1/2 yellow aji limo chile ,[...]

2 lbs fish fillets (such as flounder, sole, or red snapper) salt , to taste 1 cup fresh lime juice (about 12 limes) 1/2 teaspoon salt 1 small garlic clove ,[...]