The last time I saw my Ram cichlid it was in good condition it ate competitively along with mbuna cichlids and frontosas. This Ram cichlid had been with me for more or less two months. I don't see it being bullied by other cichlids. So i was greatly wandering why it suddenly became awkward. I've noticed this behavior for almost 3-4 days now. Just last night I saw it surfacing and breathing there for a long period of time. It was lethargic. I don't think it's poor oxygen because my pump releases air into the water, and other cichlids don't behave the same. I became critical to think it's experiencing neuropathies due to high oxygen in the tank, because of it's small size. So earlier this morning I did a 25% water change and cleaned the foam in my filter. Thinking it's reacting to the water quality; because I fed the other cichlids guppies last days and it might have raised unhealhty substances. But I'm wandering my Black Ghost Knives are just doing well, which are more sensitive to water quality - right? Or maybe it's reacting to the frequent methylene blue application into the tank? and regarding this , does methylene blue kill my good bacteria in the filter? So, anyways, I'll be going home later this afternoon after my class. I hope see it improve or to observe it improve in the following days. BTW, it turned dark, though the rainbow colors did not fade. I don't think it's sad because it has no ram companions. Nor it's in mating color and behavior. Please HELP! Thanks!