hi i recently noticed one of my guppies with a grey patch on it back,and immediately got rid of it as i have had a bout of columnaris before so i wasnt taking any risks,ive been treating my tank now for five days with pimafix and myxazin,since treating my tank i have got rid of a few more suspect fish,these started to show white cotton wool like growths(im assuming columnaris) however,ive come home today and i have another guppy with growths starting to appear and one if my male guppies tails has all but disappeared,it has not been bullied it just seems the tail is melting away towards the body leaving strands behind, does ne one have ne suggestions as to what this is
?? and how to treat it
?
my tank stats are
ammonia 0
nitrite 0
nitrate 5
my tank size is 85 litre
please help!!!!


my tank stats are

ammonia 0
nitrite 0
nitrate 5
my tank size is 85 litre
please help!!!!