Hi Wakin, welcome to the forum.
Anyway with regards to your question, why not paste oyama paper? Think it will be simpler for you as i cannot think of any ways for you to tint the sides of your tank.
I am presuming you are having a freshwater goldfish tank, based on your nickname. Maybe can look into having a bristlenose pleco to help with the algae issues?
Wish i can help more but that is all i can think off at the moment as i am also learning at the moment.
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