I purchased a red-tailed shark on sunday to add to my 25 gallon tank. There's plenty of space to hide in there, and some plants. He's even staked out a territory... but the fish won't eat! There are barbs in my tank, and they're pretty vicious at eating time, but my red-tail doesn't even make an attempt (he's about 4" long). Is he blind? The water conditions are perfect as they can get, except some debris floating about from re-planting plants. I've even tried sticking those sinking pellets in his home, but he doesn't eat. Anything i can possibly do?