Recently, around 3 days ago, my male betta, Matcha Custard, got sucked up against my Marina i25 internal filter and I thought he was dead so i got the net and nudged him a bit. He swam away thankfully. Ever since then, I've been coming home to him stuck to the filter, but it doesn't seem to hurt him and he can swim away when he wants to. I'm wondering if it's safe for him to be near the filter or if I should put a plant in front to block it a bit. My betta doesn't seem to get hurt from it and I thought it might be like how some cats and dogs like to be vacuumed. What should I do?