I have a near to 2ft planted tank with ferns.
I put in some molly fish but after 4 days i discover there are some white tiny worm crawing in the tank glass surface.
They are around 2 mm to 3mm length.
Cant even use hp to take photo too small.

Can any one advice.
Oh btw there are 1" sand gravel inside too.

Thanks,

Elton