just today, i noticed my 4inch RES acting aggressively towards me. this is really unusual because i have never seen him do this before. since he was a hatcling, ive always touched him on top of his head gently, and he never retracted his head, nor shyed away. hes the only RES ive seen that actually lets u pet him.
but today, wen i put my hand down to re-arrange the filter, he lunged at my fingers trying to bite them. when i picked him up, he tried the same thing again and again
i'm not sure why he became so aggresive out of nowhere.

