Hello everyone,I'm new to the site and Im having issues with my snow whites. I have two that I purchased a year ago,they were doing okay except for the fact that every fish I purchased with them has pass them up in size,I recently noticed that they're both losing weight. They will eat,are still very active but it looks like a chunk is missing from the bottom of both,I tried looking it up to see if I can figure out what's going on but the symptoms are not matching. Any advice will be great. Thanks