The tadpole is in my opinion super hard to locate when its nighttime. It should have a light inside the cockpit or something that is always lit, or let the tadpoles own lights be brighter when looked at from outside

I find the tadpole dark too. Even a simple leave, swim 5m, collect ore, turnaround and…. play the mini-game “Where’s my Tadpole”? In comparison, the Seamoth was always easily spot-able.
Maybe a red an interior cockpit LED should illuminate when you exit it? Or a customizable color, but defaults to red. Nothing too bright, but something to catch your eye a bit more. It doesn’t help that the HUD beacon icons are muted pastel type colors, and you cant make them more vibrant