If that's your axies in the bag, and they're in the water from the petshop, you should actually put them into the container and get rid of the petshop water, even if it means pouring them into the net or into a container and decanting the water of (lid or hand over the edge so they don't slip out).
Is your tankwater in this tank cycled or not, if not, then you'll need to test the tankwater regularly (daily or every 2 days) then change 20-30% tankwater after you test it if ammonia or nitrite levels are over 0.