I just got this little guy 2 days ago. (Not quarantined) He is part of a pair. Not seeing this on the other one or any others in my tank. It’s a mixed Malawi 55gal. 0 amm. 0 Nitrites 5 Nitrates. 8.2 pH 79*F. Any ideas? I know diagnosing fish disease is difficult. Doesn’t look like whitespot.