I have a 29gal. with a Frontosa, Yellow Lab, Syndontis, and Pleco. Thats all I have left since they got like this white gray discoloring fungus type stuff on their bodies. Didn't notice it on the cat or pleco, though. I used quick cure first with no improvement. Then I bought Maracyn, no improvement. The guy at my lfs said Fu-Ba Fix works really well on just about any bacterial or fungal infection. He told me to do a 5 to 10 gal. water change since the Maracyn stays in the water a while. take out the carbon and try this stuff. So I did everything and was just about to add the Fu-Ba Fix and the bottle says how to dose but not how many times? How often? If I should dose more than once? So any help will be much appreciated. :-?