I may try the turkey baster thing and my mini siphon just to remove the water. I take my betta out because he starts going after the little babies once he can see them. I met a man recently when getting a quote for some body damage for my car. He had beautiful large tanks in his garage and waiting room. Found out he has betta’s and has had them since a child and at one point he was really into breeding them. Really interesting guy, anyway he told me to not worry about siphoning the substrate at all. He said with the low bioload the plants should keep everything in check. I dunno. I mean my water parameters are good even without gravel vacs in a very long time. Maybe he’s right?