last weekend i bought 4 juvenile angelfish and added it to my 50 g with a juvenile and an adult angel. within two days, 2 of the new 4 died because i was foolish enough to not quarantine them. today as i'm typing right now my adult angel is having a difficulty in swimming and is currently upside down. it has reddish marks on its fins and on their bases. since i have no quarantine tank set up, i put the adult angel into a bucket, filled it with tank water and added medication (azoo magic disease treatment; about 1 ml) to it. since it had no aeration, it hurt me to see my angel like this as i've grown really attached to it, so i put it back in the tank. any suggestions? thanks very much ps: i suspect my original juvenile to be sick also although i haven't proven it yet. it stays at the top of the tank and doesn't swim around too much. what should i do?