about a week ago i bought 2 3" pigeon bloods and 1 3" german blue discus. yesterday i noticed that the german wasnt eating. and today i saw a couple of spots on it. what should i do i want to raise the temp but im afraid it might kill the fish. my fish are 10 glowlights, 1 clown loach, 2 otocinclus, and 4 discus. i couldnt quarantine them because i dont have enough money to buy a small tank.