My male Betta fish is not doing to well, according to me. He is always either at the top of the tank or at the bottom of the tank just sitting there. He is not moving and sometimes he would look like he has a little bump where his kidney is. I let him sit for three days without eating because I thought he was constipated and it didn't really work. He looked faded and sleeping all the time? What is wrong? BTW I have a 2.5 gallon tank and I don't clean the tank super often.