I have to agree with Mcgyvr here, no need to tear down the tank. Lets see if we can help you figure out what you're dealing with and give suggestions on best course of action.
it is really hard to tell what it is from the picture you provided.
Couple things we'll need to know:
What size is the tank?
how long has it been setup?
What are your current parameters, especially nitrates and phosphates? Please don't just say "the numbers are good" or some variation, we need hard numbers.
if you can get a better picture that would be great but also if you could describe the algae that might help as well. does it look like snot? does it have any air bubbles attached to it? What color is it?
Does it blow off easily with a turkey baster, does it feel slimy?
I know this is a lot but it helps to identify what you're dealing with.