To be honest, nothing fits that bill exactly. With some exceptions, corals feed more on zooplankton whereas clams feed on phytoplankton (but as mentioned as they get larger they depend less on feeding than they do on lighting).
If you dosed DT's (or other phyto type feed), the claim is that the infauna (zooplankton) in your tank will feed on that, thus fueling a population surge, thus there is more available to the things that feed on it.
But IMO/IME feeding phyto and zoo to a tank is a delicate thing. If overdone you can fuel massive nutrient surges in your tank.
Anyhow all I do for my tanks is feed a little DT's in the tank that has the clams in it, and then a little cyclop-eeze in all my tanks. I've noticed that even my acros will occasionally capture that stuff.
If you really wanted to go crazy there are things like oyster eggs, golden pearls, rotifers, live rotifers, the list goes on and on. Beneficial? Maybe. Mandatory? Not whatsoever. Risky? Possibly -- like I said, it's easy to overfuel your tank and make it a nutrient soup.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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