Originally Posted by Sniperhank
An old credit card is all you need for coraline algae.
Man, I have been bending the stainless steel blades on my scraper and have put so much pressure on it that the handle bends. I just had a canopy top built with my new LED
lights and cannot reach the trouble spots where the algae grows fastest. The tank is 48" wide x 33" high and 13" deep so it's tough getting it done. I'm afraid the credit cards wont work. Besides, wouldnt the salt water mess up the magnetic tape on the card?