I have a 10 gallon fish tank with gravel and driftwood with airstone and water filter. Also have few Anacharis plants. I added driftwood week ago put them in hot water before adding. I noticed one of my fish is getting pale white algae like spots on head (only left side Please see pictures), and acting little calm then before. I am worried if that some kind of disease or something. can you please help to recover my fish.