Hi everyone! I really need your help. I have a betta, his name is Mayo. He has a 3.5 gallon tank, with a heater, a filter and a live plant. The other plants that are fake are silk plants. He is having some issues with his fins. I thought at first it could be fin rot and added some primafix and stress coat. I only got him a week ago and just added some new rocks and gravel to his tank so I thought maybe that stressed him out. He is swimming around the tank normally and eating normally. His bottom fins look shredded though and a chunk fell out while he was swimming around. When I came to turn his light on today he seemed stuck next to a rock. I tapped on the glass and he didn’t move so I moved the rock and he started to swim around. Could the rock have shredded his fin? The rock is ceramic and very smooth on the inside where he can hide but just a tiny bit rough on the outside. Not even rough but more like gritty. I’m really concerned as I just lost my last fish due to a severe fungal infection I didn’t catch in time. I’ve added some pictures of his fins and the rocks that are in his tank. Thank you!!