http://www.melevsreef.com/mandarin_care.html
http://www.melevsreef.com/video/mandarin.mov
http://www.melevsreef.com/video/diner4.wmv
A pair may be too much for the size you have, one can eliminate a pod population in months.
Create a pod hideout in a refugium or a stack of rocks where the dragonets can't get to.
With luck you can get them to feed on PE MYSIS shrimp. I am lucky and have been able to keep one alive for well over a year this way. I think the key is that I have a barebottom tank and the Mysids fall to the bottom where they dance and are scooped up.
It wouldn't hurt to get some live pods and replenish the system periodically.
http://www.essentiallivefeeds.com/
BTW, I think the rule of thumb is to wait 8 mos to a year before adding one, much less a pair.
Like anenome, these fish have a dismal track record and often starve.
FWIW, mine hides in the rocks most of the time and I rarely see it.