What is the fewest goals of CD Alcoyano with more than 25 points?
CREATE TABLE "group_ii" (
  "position" real,
  "club" text,
  "played" real,
  "points" real,
  "wins" real,
  "draws" real,
  "losses" real,
  "goals_for" real,
  "goals_against" real,
  "goal_difference" real
);
SELECT MIN("goals_against") FROM "group_ii" WHERE "club"='cd alcoyano' AND "points">25;