I have a Volitan Lionfish. I have had him since April of 2010. He has always been active and lively in my 180 gallon tank. I have not added any new tank mates recently. Currently, the co-habitants are: Niger Trigger, Clown Trigger, Snowflake Eel, Queen Angel, Sigapore Angel, Yellow Tang, Convict Tang, 3 Damsels, Porcupine Puffer, Tomato Clown.
The usual diet of my Lionfish is frozen krill. He has been eating this since day one and I usually feed him every other day. I fed the Lionfish scallops about 1.5 weeks ago. Since then, he has not eaten and has been hanging out in a cave. He lies on the bottom of the cave, not moving and lifeless. His fins are drooping and he has not left the cave in a week and a half. I am very upset because he was one of my first fish and I am so attached to him.
I have checked all parameters in the tank. The nitrate level is between 5 and 10. The pH is 7.8. The ammonia is 0. The temperature is about 81 degrees. I know the temperature is a bit high but with 4 submersible pumps. I do a 40 percent water change every 3 weeks. I heard buying Rosey Red Minnows or Ghost Shrimp might temp him. Is this true? Should I quarantine him? What can I do to save him?