Neon Tetra Help, Please, Thanks.

[Neutral_Water]

Neons are a prey fish and use group behavior for safety. The behavior you described, keeping low to the gravel in a group, and staying put with opposing fin flicks is part of their defense behavior. Totally expected in an unknown area like after being introduced to a new fish tank. They don't know what monster might be lurking so they sit tight while they check things out. Once they figure out there isn't a monster around they will swim around the whole tank.

Oh my goodness yeah even when I put these in the 30 gal they still stuck low to the gravel kinda for a good half hour or so explains why they did it now, thanks heaps mate