Fine, I'll wade into this... Here's my background with mandarins: For over the past decade, I've taken in dragonets from friends and local reefers to "train". I've had mandarins that were plump and healthy, but the owner wanted the fish to start with me "just in case" and i've had mandarins that were super skinny with fully depressed bellies. I'll start off by saying having pods is preferable but is not a must. People will fight me on this and recite what they've read in magazines and online. It's not true. Every mandarin i've taken in has gone through a month QT at least without pods and this includes both Biota AND wild caught dragonets, so yes, they can be trained to take frozen food and I've had extremely good results doing so. If you already have sufficient pods in your tank and you observe the dragonet eating, leave it there. I personally have a wild caught green mandarin that eats full sized pe mysis (yes, the 1/2" ones). There are things to keep in mind though... First up, you have to be extremely patient and keep the fish from stressing out. If it's stressed, it WILL NOT EAT. That means not putting your face next to the tank constantly to check on its condition or trying to feed it with other fish pushing the mandarin out of the way. They get intimidated very easily and if it's sitting motionless on the bottom with its tail curved, it's probably stressed. How I approach this is by not making sudden movements near the tank and using a long pipet for feeding. I gently swish it towards the mandarin from at least 6" away. Let the food settle on the bottom and give it a VERY light swish just to move the food a little. As a starter, I used to use Nutrimar ova (when it was available), mixed with baby brine. Live brine is the second best food option to live pods IMO. Some people claim success using rotifers or cyclops, but I haven't personally. If you try feeding baby brine, put a flashlight or similar pointed at a bottom corner of the tank. Weak mandarins, don't like to lift far off of the bottom to feed and will usually ignore food that's only 1/4" off of the bottom. Hopefully, you'll get a feeding response. Look for the fish to perk up and start bouncing off of the bottom. If the mandarin stops moving, lightly swish the food at range using the same pipet. ONLY use that pipet. Again, try to keep yourself and your actions as hidden to the dragonet as possible. Hope this helps.