how to make a tank divider?

I'm on day 5 of having axolotl eggs, and they are starting to
turn into little curly shapes, so at last I'm fairly sure the
male did his bit and at least some of them are going to hatch.

I want to divide the tank - the eggs are at one end, and I'd
like to fit some kind of divider before they hatch, which gives
me about a week, I think.

Now I thought of getting a sheet of plastic and cutting it down,
but the filter (an air-driven box one) is at the end with the
eggs. So I do need water to pass through the two sides, so it
doesn't become stale in the larger part where the adults will
remain.

I thought of drilling holes in plastic, but this might shatter,
I dont know what size is needed, and if too big the babies might
get through and get munched. Also, I'd need to use masking tape
while drilling, and I don't know if the adhesive would remain
on the plastic and cause a problem.

I thought of making a frame and putting netting over it - like
on a breeding net cage. I don't have any ideas where to get
netting or how to go about it! And I did think of some kind
of material - like stockings or something - but I don't wear
girlie stuff so don't have anything like that kicking about.

Anyone got any useful ideas? I've got lots of speculative thoughts
but if anyone has really done this before that would be the
most useful :-)

Thanks!

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