About 3 weeks ago we purchased a new Oranda goldfish from our local aquatics shop. This Sunday evening I noticed that it was out of character and sitting on the bottom of the tank hidden behind an ornament. Normally this fish is swimming around and seemed relatively happy. Feeding doesn't seem to be too much of a problem, the fish does come out when he hears movement etc. I didn't notice too much wrong with the fish - some slight discolouration/white bits on the wen/head but I checked a few pictures I took when we first got it and they appeared to be there at that point in time.
Fast forward to Tuesday morning and the fish is still acting in the same manner, except this time I notice almost like some sort of graze/loose white skin stuff on the top of it's wen and at the side. It's relatively small but after checking out online I think it might be a Fungal infection.
Tuesday afternoon/evening I picked up a bottle of Pimafix and did a 25% water change + cleaned my FX4 filter/canister as I haven't done it since setting up the tank (June/July time). To my surprise the filters weren't that dirty at all, just required a rinse in the old water. We have a 250 litre tank so I added about 35ml of the Pimafix.
This morning I came down to feed and checkup and a different fish (Ranchu) which has been healthy appeared to have a small white bit of loose skin or w/e it is on it's head also.
Starting to get concerned at this point because I don't want to lose any of the little guys and any help would really be appreciated. I have taken some photos but they're not very clear. The first 3 photos are from when we first purchased the fish a few weeks ago. I didn't note the white bits as I thought that might have just been the fish but it appears to have gotten worse more recently. The last picture of the Ranchu also shows a white bit hanging off from it's head which was not there before this morning.
Thanks.
