The aluminums I saw only come in 3.5ml, not the 2.5ml I got.

Rather informative, and not written by as to make your head explode trying to digest it. That link appeals to my inner nerdRather informative, and not written by as to make your head explode trying to digest it.
Thanks for sharing that one Ocelot!
I guess that means you didn't see my post earlier on another thread when someone asked why polycarb cracked...
I am not a rocket surgeon by any stretch of the imagination. I read a fairly long explanation about it, which of course I didn't really understand and can't remember most of (I must try and find that again for my files). I think is has something to do with the way molecules (which I think should be called multicules 'cuz there's always lot of them) that make up the plastic-whatever-thingys are held together - I seem to recall there was something about some configurations being "tight" while others were "loose" and would come apart easier...
Obviously, I have no freaking clue what I'm talking about. I must Google.
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Thanks for the help, guys. Copped an aluminum tank, just worrying about the whole "not seethrough" thing. How do you know when to top it off again?