Keeping tropical fish does seem an attractive and relatively inexpensive
proposition.

However, as mentioned, the pond is very shallow, being only a few inches
high during operation and is furthermore covered and saturated with river
rocks. They serve to cover the bare concrete floor.

There also appears to be a leak somewhere which prevents us from keeping 80%
of the water in the pond. You can try filling it up to 100% but you need to
keep pouring it on.

Having said that, the remaining 20% of water stays there in a comfortable
state and does not drain away. The pumps being underwater appear to be
working and operating even in such circumstances.

I'm trying to locate the leak at the present, but in the meanwhile I thought
that placing some extra chlorine or perhaps herbal oil or even cheap lemon
detergent into the pond to discourage mossie breeding.

If I may bother you denizens for some commentary on my actions, I'd
apprecate it.

Cheers,

Wilde