Haven't used the Piscine Energetics brand, but my fish went for the Hikari brand- no prob, but not for their jumbo mysis. weird.
Check with our sponsor at Aquatic Foods- might want to get a mixed order of Hikari frozen mysis, brine shrimp, and blood worms for a good price, if you'll go for 10lbs or more... the way it's packed, it should keep indefinitely in the freezer, and it's all good food...