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Hello guys, I'm upgrading my 120 gallon glass tank to a 235 gallon acrylic tank. I just bought it from a local reefer and it will be serviced so it will look brand new. My question is how do you clean the inside part of the tank without scratching the surface? I use mag-float on my glass tank and it does the job except from time to time I have to use razor blades. Any idea on how to remove those algae?