[Randy Holmes-Farley]

Yes, I agree that would be interesting. Macroalgae growth (Chaetomorpha and Caulerpa racemosa) does not appear adequate to reduce copper in my tank below about 10 ppb, but turf algae may be different (or not). I don't know of a reason to assume that turf algae will be better, but it just might happen to be true.

Regardless of how much surface area of turf one had, I don't think it could grow too much more rapidly than my macroalgae in terms of mass per day because the nutrient levels in my tank are reduced fairly far by the macroalgae, leaving little extra for additional growth by a more efficient organism. But their biology may be such that they are more likely to take up metals than either of the species that I use.