I can't get a picture because the little guy is pretty camera shy. It's not cotton like, it looks more like semi-dried glue. He's eating well and the water quality is fine (0 nitrite 0 ammonia and 10 nitrate) what's up with him? He lives in a 60 gallon grow out with a 5" Vieja maculicauda. He/she is 2.5"
