"Paul Kelly" wrote in message
...

"Peter Hughes" wrote in message
. ..

3. Put grid over them, though unfortunately they're rather awkward
shapes.
Anybody care to share experiences or ideas, or is this covered by an
appropriate FAQ?

try:

http://www.ornamentalfish.org/aquana...s/safapond.htm

usual caveats... I am not recommending or warranting the safety etc etc


Better still I've found the company site - the link on the first one did not
work

http://www.entdirect.plus.com/safapond/

pk