sorry if its a stupid question
but from all the videos I see of awesomely HUGE CA/SA Cichlids....how come owners keep very little substrate in their tanks to the point you see areas showing the bare bottom of the tank? Is it to have as clean water as possible purposes? More room for the cichlid? I guess I just always wanted to know if there was any advantages to doing this 
but from all the videos I see of awesomely HUGE CA/SA Cichlids....how come owners keep very little substrate in their tanks to the point you see areas showing the bare bottom of the tank? Is it to have as clean water as possible purposes? More room for the cichlid? I guess I just always wanted to know if there was any advantages to doing this 