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The voltage rating of Algal Bloom capacitors has changed a few times...the current capacitors I'm using can withstand it, but not all in the past, so I don't want people going and frying their pedals. And even if a capacitor is rated at 18v, it's best to have a higher voltage rating if you're going to be running 18v. So I've always said to run the Algal Bloom at 9-12v because no one's going to fry their pedal at those voltages.
Fun fact: if you run an Algal Bloom at 12v, the Starve/Power knob now starts at 12v, so you can still notch it back to run at 9v.
If anyone wants a 12v adapter, PayPal me $10 (or $12 if you want a daisy chain with it) and I'll send one your way. My PP email is in my ILF profile.