the other day i noticed that 2 fish had white spots on them. the other 2 fish and pleco didnt. i was going to add the copper safe after i did a 75% water change today. well today when i woke up i found that 11 fry are dead and so are 2 platys. i still have the pleco, 2 platys and 2 fry. the ammonia is 1, ph 7.2 and nitrate and nitrite 0. the tank has only been set up for 1 1/2 weeks. is there enough fish to cycle the tank? if they all die how do i cycle the tank? the last time i had a tank i still made all of the newbie mistakes but they all lived, im so confused.