3 sudden deaths please help??
I have a small but what was a thriving colony in a 0.5 gallon tank that still appears normal with pairs often mating, I have 4 pregnant females. They’re super active and show no signs of stress. I found one dead shrimp (juvenile) yesterday morning, and a a mature adult this morning. I now have a pregnant female at the bottom of the tank still kicking a bit, but doubtful she’s going to make it.
The only thing I can think of is accidentally over-feeding live phytoplankton two days ago.
Any advice on what could be happening or what to do would be greatly appreciated!! I’m new to the hobby but do a lot of research and I don’t know what is suddenly going wrong!
Tank info:
0.5 gallons
Salinity (tested with refractometer): 25ppt (I know this is low, I’ve been gradually increasing with instant ocean over weeks after I got a refractometer and realized this tank was extremely low even though they were doing fine then too!)
Water temperature: 75F (10W heater with thermostat)
Air stone runs intermittently for 8 every 6 hours plus an additional interval at night (even with multiple control valves and an air escape tube I can’t get a low enough stream to leave it on continuously)
Feed: live phytoplankton in small amounts every ~1-3 days
The only thing that has changed is extremely gradual salinity increase with daily increments. Please help!!