I recently did the first water change in my betta tank(about 40-50%) and now Fudd has a little white thing on his side and 1 on his lower front fin and between his bottom back fin and his tail fin. when i look from the top of the ank he looks fine but other than that i see the spot. also his gills are kind of puffed on the bottom part of his he like a deflated bag. I put alittle aquarium salt in to see if it would help. any ideas?