sick keyhole cichlid... dianosis/treatment suggestions?
I have a 38 gallon tank with 4 keyhole cichlids, 4 panda cories, and a clown pleco. One of my keyholes seems very stressed lately. He spends all of his time in one corner of the tank behind plants, and is showing dark colors typical of a stressed/frightened keyhole. His fins are clamped as well. He only comes out during feeding, when he eats and returns to his normal coloration. His fins are clamped even at this time.
I know that there is something that is stressing this fish, i just have no idea what... all other fish are healthy, temp is 78, pH 7.4, ammonia 0, nitrites 0, nitrates 5
I added some salt a few days ago, which has had no effect... i have never had any success using meds, but i am willing to try if someone has a good suggestion