i have a problem - my tank which has been established for a few months now, and has always had 0 amonia readings now has a slight reading. this could maybe be because i added 4 fish recently. all the fish other than these 2 mollies are healthy and behaving normally. i would do water changes but my 2 mollies have cotton wool growths and so am treating them for that and the medication says "before redosing or using any other treatment in the aquarium you should wait a period of seven days then carry out a 30% water change before dosing." i wouldnt normally use an amonia remover but since i cant do water changes i considered it. however it says that the medication is nott o be used with amonia remover. i dont know what to do. i dont want to let amonia get high and risk hurting my other healthy fish but i dont want to do water changes when that would dillute the medication and risk the mollies dying, or it spreading to toher fish?!?!?