Test cold water vs gammarus or scud

Will update the result here later

1st test , i forgot take out the small box,
Frezee the scud, after 2 days room temp still no sign of life,success

2nd test after i catch more 10 scud later

It may work. I put some in an outdoor tank earlier this year and the temps dropped to the low 30s. All of them perished. Last year I tried it in the same tank when the temps reached 90s again all perished while the pond snails survived just fine. I did not have an air stone in the tank. Don't know if that makes a difference as well.

The hotter the water, the lower the 02 saturation.