1) well the tank is 30, 16 & 12 inches, so i guess is 29 gallons.
2) the tank has been running for at least a year now.
3) i've got 4 goldfishes: 1 black moor, 1 water-bubble eye, 1 common goldfish and 1 lionhead goldfish
i've also got 1 molly, 1 petco algae eater, 1 type of gouramy fish, and 1 albino cory.
4) i use aquaclear 150 aquarium power filter
i've been also changing water frequently.
Let me explain the problem again. the problem got to when the goldfish got infected of ick. i saw white spots in them, so i used this "ick guard" medicine for 3 days. during these three days, i took off the carbon, sponge, and the anti-amonia stuff. after 3 days the fishes started to get depressed, so i stoped giving the medicine anymore. also i put the filtration back in. then, i noticed that the goldfishes started to get more white spots. the next day, the bubble-eye goldfish was bleeding and his bubbles where blown off. now they're half-away blown. i started the medication again for a day with the filter on. nothing happened either, and that's about it.
oh and by the way, i donno but im noticing that the molly is acting like crazy sometimes. he moves his head and body quickly in one place. is that normal?