Hi Adrian, my experience has been the opposite, I guess I am lucky. I've
had more fishtanks in the (nearly 11) years I've had children than I had
before - without a single adverse incident. Mind you, I don't consider
grubby pawprints on the glass as being too adverse ;) When they were old
enough to stand up and press their snotty noses against the glass it gave
me a great deal of pleasure to see their delighted looks reflected in the
glow of the tanklights.
It does take a bit of planning though... no cords placed where they can be
pulled down, no fishfood (or anything else) placed where it can be eaten
or dumped in the tanks, all tanks at ground level shrouded in complicated
covers to restrict access, no hammers left in the house. I think a little
paranoia goes a long way, as in every other aspect of life. I've always
kept anytyhing that would be harmful if ingested up as high as I can out
of reach.
Cheers, Andrew