Minimum dec in-game to hold

Is there a minimum DEC in-game to hold to be able to get DEC rewards on chest?

Good day fellow Splinterland gamers! Can someone educate me about DEC on chest rewards. Its been two weeks since I played Splinterlands. I also bought the splinterlands spell book on my two accounts but not even a single DEC on every chest that I got on every daily and even the season ending chest rewards. Its always been potions and credits. I just want to ask about it. Thank you and have fun playing.