You don't really know what would be enough, and it would eventually become a competition between the Wrasse and the Mandarin, like TC said, since they both eat pods
like fat pigs.
And i mean, a 30 is a nice size tank.. but it really isn't THAT big. I'll tell you though, if you tried feeding your Dragonet with store-bought pods
.. you would sure be making that LFS
rich. Dragonets could eradicate a tankfull of pods
in probably less than a week, and i've heard this from some people. You should read this thread: