Hi. Wonder if anyone can advise what could have happened to my Bettas fins. Firstly the dorsal fin got damaged but by the time I noticed, new growth had seemed to appear, no sign of infection then today I've just seen him like this? I'm gutted. Has he damaged them on something? Filter intake possibly? Or is he nipping his fins? There's no plastic in the tank, parameters are 0 ammonia,0 nitrite with 5/10 nitrates. I did a 30% water change Friday when I noticed the first damage. Otherwise we go a change every 5/6 days. He had such lovely fins. I'm gutted. Any advice please? Thank you