Sharing my experience. I bought a female green mandarin more than 2yrs ago. The tank was mature but I added Tigger pods into sump anyway. It thrived and eventually learnt to eat pellets. No training. Just incidental. Then I got a male about a year ago. He immediately got along with the female and did their mating dance regularly when lights were dimmed. He was skinny but has since fattened up. He too has learnt to accept dry food. From this, I conclude that dragonets will learn to eat pellets if given time. But during that time, there must be adequate live food around. So u must hv a sizeable tank (no nano) that has been around for 6mths at least. Live rocks and sand are essential I reckon. A refugium helps too. Sent from my SM-G901F using Tapatalk