<a href=showthread.php?s=&postid=10611099#post10611099 target=_blank>Originally posted</a> by Kannin
Rabbits are adapted to feed on lettuce but, a rabbit left to eat a diet of nothing but lettuce... will die of malnutrition in relatively short order.
While people have made some very interesting comments (and side arguments

), I think this, perhaps, is one of the most intelligent things stated in this thread and a point to lookat considering the side arguments.
We're not discussing a sole food item. We're talking about vegi-based supplementation for your fish. Fish are naturally opportunistic feeders for the most part, with specific predispositions and evolutionary adaptations for certain diets. However, no solitary, singular food stuff can really give your fish everything it really needs nutritionally (unless you're one of those people who makes their own fish food and fas found an excellent recipe- you guys can ignore this part of the discussion). Tangs need a ton of vegitable matter, but they also need foods high in protein, such as mysis.
So, getting back to the subject at hand, which is what, persay, to feed tangs or other fish with a need for greens.
I'd definitely recommend as a first pick nori. You can generally find it for a really excellent deal at your local farmers marker or a grocery store with an asian theme. You can also sometimes find it as specialty grocery stores that focus on organic or healthy foods (our local Whole Foods has it). As a dried food, it stores well so long as you keep it dried, so crack out that Tuperware from a party ten years ago (when Tuperware parties were fun), Ziplock, or Glad! If you live under a rock (I have a friend who did, and I sometimes feel like I do) without any such stores, you can usually find Seaweed Strips from Ocean Nutrition or Julian Sprung's Sea Veggies flakes (although, admittedly, a good friend who had the pleasure of hearing Julian Sprung speak watched him call out another attendee of the lecture for feeding this, stating that it was really designed for use by zoos and professional aquariums.... so, to each his own).
If you want to go fresh but keep it really naturally, why not grow caulerpa? I once knew a client take water from his changes on his display tank by using it on a secondary tank to grow caulerpa for his tangs. After a while, the little tank became a neat sort of caulerpa-dominated display, and it was a great supplement to his main tank. Other keepers have done a sort of "feeding rock" technique where they keep smaller pieces of liverock in conditions prone to starting hair algae and, then, placing a piece at a time in the main tank for herbivores to graze on (and swapping them out as needed). Although, some people frown upon this technique, stating that it's just a quick way to start a bloom of invasive and undesireable algaes.
I have often heard of people using various different terrestrial veggies. I've seen zuchinni and romaine lettuce as two of the more common ones, as well as spinach. However, now, it's becoming very popular to feed brocoli. Many keepers have noticed a marked difference in fish with HLLE after feeding on a diet including brocoli. Other keepers have used brocoli with selcon to also help get rid of HLLE.
However, like I said, we're not talking about using that exclusively. Other keepers have attempted to meet the needs of veggie craving fish like tangs and angels with things like Emerald Entree from San Fancisco Bay Brand to help meet these needs. It's a frozen food with krill, mysis, brine shrimp, plankton, romaine, red leaf lettuce, spirulina, and spinach (among other stuff). Other people chose to directly use a spirulina flake or soak with their normal food stuffs (such as Kent Marine's Zoe).
At any rate, keep it varied up to avoid issues, but remember, individual results may vary. :rollface: