Hey ive started new filterless 7.8ltr jar aquarium for shrimp. I used a mix of old substrate with some new added, roughly 50/50 cycled tank water from my aquarium and fresh added with quick start api. It's planted with java moss (new), some cuttings of Limnophila Sessiliflora, and tissues of Glossostigma elatinoides. I've also added a 10w betta heater present to 25*c which seem to work well. My pH is 7.2 with 0 ammonia, nitrite and nitrate. I added some co2 booter and leaf booster earlief in the week. The problem is I added some shrimp and the didn't last more than an hr. They were fine after acclimatising using the water which by the end the had 2x the amount with them over their original and sat for around 40 mins to be sure. Question im asking I, I know shrimp can be very tender and im not were what may have caused the die off.