I have a 125 SW with CC. Have a friend that gave me a sand sifting star as he just bought it and his bristle stars were eating the sand sifter. Have had him in the tank now for 4-6 months and has been doing great. Saw him for the first time the other day and he is VERY skinny. Also I turned him over and his suckers and such on the underside of him is falling off. Any idea as to if he is dieing or not? Don’t know why? Im careful with my feedings so he may not be getting enough to eat…any ideas?