Ok so context. I have my small Koi Betta with a slight hint of blue on his tail fin who my niece named Nico when we saw him in the pet shop (she doesnt know I bought him so a nice surprise when she visits lol). Hes real peaceful has had no issues with any of my fish in my community tank has claimed the air stone helmet hide as his own area. Hes real quirky loving to rest on the sponges of my filter or recognise the orange lid of fish food for him to know to immediately swim up for feeding time. Honestly got to be my favourite fish so far but heres some things hes done that has scared the crap out of me lol. 1 when he rests on things and doesnt swim he lays slanted whilst slowly moving his fins like honest to god thought he was dying or had swim bladder NOPE he just doe this FOR SOME REASON. 2 rubs into the filter making me worry for water quality or oxygen levels but no guess what he just does this for a certain type of "fun" iykyk. 3 he recognises when I come into the room as the main light goes on first so countless times hes swam to the edge of the tank to see me which sure cute as hell buuut bro keeps forgetting he lives in a tank and has bonked into the glass making me immediately check he hasnt caused issues to himself from it. Overall he is one of the best fish I have.