i got a new angel a couple of days ago and now it has this small cotton looking thing of its fin im thinking its fungus im not sure i havent had to deal with any Diseases sinse im kinda new to the hobby ill try and get a pic and uploaded tomorrow i wont start treating it until im sure its fungus. also can i treat the whole tank since i dont have another tank to put him in i got the meds for it i just dont want to treat it if its not fungus. to treat it do i have to do like a daily water change or anything special?