each bubble of air as it rises carries water on its surface,
the movement of the water creates current
the more bubbles the more moving water
this is how air powered UGF work
+1 to what suphew said
especially in a small volume, i have run for a few years with no chiller
but a large volume of water with the sump in a cold basement
yes i will swap you
you give me one and i will give you 2 back in exchange
repto is right she will sit on them a day before they do the plummet
they are light and fall well
put a box over her and move the whole lot together, she may get off though
best is to leave her where she is, time the hatching and when she has hatched all then move them to ground