I have a Parrot fish that just started to lay down on the gravel and doesn't move. Some history of tank. My Peacock Cichlid died for no apparent reason about 2 weeks ago. I cleaned tank up and we purchased a Green Terror and put in tank. The Parrot fish has chased the green terror all over the place ever since up until yesterday. I thought he was finally accepting his new roommate. Today all of the sudden he is laying on the bottom of the tank barely moving. I opened tank to check on him and he jumped up and went into his cave. So I sat back down. A few minutes later he's back out there laying down barely moving. So I went and tested tank conditions which are: pH 8.1, Ammonia 0.5, Nitrite 0, and Nitrate 5. The tank has been running for a little over 5 years. Our biggest problem with it has been keeping the pH up. He just got up again and is hiding in the corner. My husband says that he's been racing around stealing the food from the green terror and the bristlenose pleco.