u/Fiesta_Time2077

I have a bunch of these little guys in my tank, I don't think they harming anything, but I don't know what they are

I have a 35 gallon tank heavily planted and I'm wanting to start CO2. I'm completely new to CO2 so I'm looking for some tips or any advice that anyone may have. I wanna give my plants the opportunity to thrive effort that CO2 is really good for that especially for heavily planted tanks like mine. I'm also gonna be getting a smaller cartridge filter probably later today as I write this.

Is my snail's penis out? What the fuck is this? Also sorry for the audio. I was listening to an audiobook.