http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=green-spots-on-my-tank#1 There are green spots on my tank, can anyone please suggest as to what are these and how can I get rid of these green spots? thx, Elly original post: February 28, 2007, 2:34 am anonymous 2008-05-01 http://forum.aqua-fish.net/?topic=green-spots-on-my-tank#2 If your green spots are on the glass of your aquarium it is green spot algae. You have a lot of light and low phosphorus. If you want to try fertilize by phosphorus be very carefull. A high amount of phosphorus can help to explode grow another algae. Wampa 2008-05-01 http://forum.aqua-fish.net/?topic=green-spots-on-my-tank#3 Hi Elly, Have you tried to scrub them off? anonymous 2008-05-01 http://forum.aqua-fish.net/?topic=green-spots-on-my-tank#4 Thanks Wampa . Gonna try it. RE second question... Yes, I have tried many times to remove them, but am unable to. anonymous 2008-05-01 http://forum.aqua-fish.net/?topic=green-spots-on-my-tank#5 Hmm, well they are definitely diatoms or colonies of radiolaria. They are basically composed of calcium and silica and are very very difficult to remove. I have similar problem with my tank, but they are not harmful to the environment of my tank, so I just avoid them, don’t scrub too hard to scratch the glass, so I guess you should do the same, or if you find anything that will help you in removing them, please let me know. Ray anonymous 2008-05-01 http://forum.aqua-fish.net/?topic=green-spots-on-my-tank#6 I have used in the past a good reliable implement,a toothbrush-works wonders mickey 2008-05-01