Something happened in my tank last night and its got me baffled. I did a small water change with the same chems I always use but added 2 tbl spoons of salt to 5 gals of water. My salt parameters are defintly within the limits, but this morning I noticed one of my mosquito fish was SCALELESS! Now this evening I looked and shes still swimming around but the other big mosquito (about 1.5") is dead and also scaleless. One or two of the smaller ones look like theyre missing a few also. Have any of you ever seen this before? I need all the info I can get please help.