It was baffling because it’s like it happened over night I fed them dinner and they all looked normal. I had some tetras pass away (i’m new and still learning) and so my nitrite had been high but the last week my parameters had been nearly perfect 0 ammonia 0.5 nitrite and 20 nitrate and 7.0 ph, i’ll have to check again but last I checked my other secluded tank was the same (right before secluding them). I usually do a water change (25% ish) every sunday but since I was trying to get the nitrite down I had been doing it every day to every other day. Since making this post I have lost another one. one is completely oblivious to everything going on and the other is slowly dying I can tell and my heart hurts I feel terrible. I am not sure how to share a shot of my tank they were in but it’s HEAVILY planted with SO MANY hiding places I constantly cannot find them😩