My betta, Alpha, just ate a rock that was floating at the top of his water. I didn't think he would actually eat it so I didn't try to take it out, but will he be able to pass it? And his fins were turning black at the tips and thinning and getting a few small holes in them and his gills seemed black and inflamed so I bought some aquarium salt and his gills seemed to immediately get better and and some of his fins aren't as dark. I started using the salt two days ago when I cleaned his tank and I cleaned it again today. His head also turned black when I got him and under his head is white... will he be okay?