do you guys think it would be a good idea to put gravel in a tank with bichirs? i've got a 16" congicus and a 15" endlicheri in with a motoro stingray and a peacock bass in a 180 gal and i'm planning to add gravel in a bare bottom tank.. but i recently heard of some bichirs dying to due gravel being caught in their throats when they feed.. has anyone had this experience with their bichirs?