Personally, I wasted a ton of money on bottled pods and my mandarins would still die til I started training. I found the greens to be a lil more difficult, just took a lol more patience. My green is in a 29 cube with 2 clowns, 4 firefish, a blue spot goby, and talbots damsel to give you an idea. It's easier to train in a smaller tank simply bcuz of less space to chase him around in lol. I just use the coral feeding tube that looks like a turkey baster. Every night I throw some pellets in first for the rest of the fish, then slowly put the PE mysis right in front of the mandarin. At first they like a lil flow to hit the mysis, I guess they think it's alive that way? You really just have to target feed every night so they get the hang of it. Definitely best to start out with a fat one. I also try to place a few out of flow so they can find them. It's really just a matter of patience and daily target feeding. When you go to pick one out, have the store feed in front of you to see who interested. It's not as hard as I always thought it was. Just patience and persistence. Even training in a 135 is cool, so long as you can slow the flow at feeding time so he has a chance to catch the mysis and learn the drill. But to be totally honest, the spotted are easier, more personality too. I prefer the markings of the green, but spotted are easier in every sense, and definitely respond to you more. Just food for though. Either way, you just have to be persistent about target feeding. I also like to dangle the mysis at the end of tube, teaches them that the tube is where their food comes from, after a while, they start coming to you at feeding time.