bluey looks like he took a chunk out of his own tail, and lately his tail is looking really frayed and weak. they're really heavy for him, i know, but this looks a little different. it doesn't look like the fin rot i'm used to, but maybe it is? he has a 3 gallon tank, and change half the water each week like clockwork, use aquarisol as a preventative, 1/2 tsp salt per gallon, and stress coat, 7 drops per gallon. temp is regular at 80 degrees. i vacuum the gravel each week, as well. i'm going to do a full water change and might add some jungle fungus eliminator. any other ideas? see the photo below. i've sent photos to his breeder as well, but thought it would be worth it to get some suggestions while i'm waiting for her reply. thanks!!