i recently added a school of green chromis to my reef tank 5 to be exact after a week or so one has died and i noticed he was always away from the school and would hide in the corner so maybe i just thought he was sick, however i come home today to find another one dead and my clean up crew already took care of it. i have two cleaner shrimp in my tank one blood and one regular skunk cleaner. however i have a 35 gallon cube with not a lot of ample room for them to hide out from predators, when i first started i lost a hippo tang due to stress and i believe the shrimp were the cause of it now i feel the same way with the chromis just because they’re maybe like an inch long like the tang was. i haven’t recently tested my water just since my tanks been doing really well.