Hi Marcel, Sorry to hear some died 🙁 Do Oreichtys eat the shrimp in the tank.
Well ok it never is what we like but some fish live longer then others.. I have the same with the hara jerdoni, these also like colder temps and rather die soon if kept at for example 25°c also lost 3 Hara's over the past 12 months.. That was also a reason to go down to 22°C.. I have no idea about the Oreicthys and temp, i thought the best description i could find was seriously fish. But the way the describe this fish is 80% contrary of what i experience. This species is still to rare and not well documented enough to be conclusive. And next to this i still don't know if it is wild catch or captive bred. It might be wild catch and than never can know their age of course. 🙂
But they occasionaly catch a cherry shrimp, but this is not their main diet over all they do not look at the shrimps.. And the cherries breed way to fast they just can't keep up with that. I started with 30 cherries and definitively have over a 100 now and only witnessed it twice them eating a shrimp.