- I would recommend the acrylic pad versus the BLUE one made for glass. Acrylic pad is more gentle, but you will have to use more pressure & little circular motions to remove the little green algae dots.
- You can use the razor blade, but I'd advise against something so sharp if you have NOSY fish that like to follow your hands around during tank cleanings.
Not sure what kind of LIVE plants you have, but get a few more plants & they'll out-compete the algae for nutrients.
I had the same green dot algae problem with my 30G acrylic tank. Ended up getting more plants & scrubbed the tank down with the PAD every 2-3 weeks to keep the dots from getting out of hand.