lundi 12 janvier 2015

What are theese yellowish spots on my tank?

Hi i have a acrylic tank and i noticed about 4 months in i started getting this stuff growing on my tank its kinda hard to scrub off and i dont scrub it at the bottom because im afraid that i will get sand in my scrubber and scratch the acrylic. what is it? can it be prevented? is their a better way to clean it off? and how do i clean it near the sand without damaging the acrylic?




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