Re: Please HELP
It is most likely algae. Safe to touch? Probably. I would still dump the parts (not including the tubing) into a big bucket of hot water and ammonia outside where it will ventilate and not kill you with the fumes. Then, I would throw out the tubing and get fresh tubing. Don't let the metal parts sit too long in the ammonia. It'll eat it up. Scrub the parts.
If your aluminum is pitted, it is either galvanic corrosion (most likely) or acid from the biological growths. My cure for both is to use 25% to 50% antifreeze. There are other solutions, true. But it sounds like you weren't the kind of person to be changing your distilled water every 2-3 weeks, and if it was galvanic corrosion, antifreeze is one of the cheapest ways to prevent the problem.
Iodine evaporates and precipitates. It will not prevent galvanic corrosion even before it evaporates. When I mean evaporate, I mean that it diffuses through the tubing and evaporates into the air. Tygon and other clear tubing is usually not 100% water proof. It is porous like a balloon and will leak like it too (very slowly).
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