Hi..

I havent had time to change water in about 5-6 weeks due
to some work and family related issues. Took time to add
treated water though.

Demineralised water or treated rain water were a better
choice..

There seems to be no ill effects and
the water readings are pretty good and consistent with the
exception of the water being a little hard. The water is
becoming somewhat cloudy. What are some of the problems I
might come across with not changing water for long
periods?

Depends on stocking and organic input, too..

20 gal. tank
Clown Loaches
1 Pleco
3 Black Molly
2 Swords
4 tetras.

That tank I suppose is much too small for clowns and even
for swords and this might finally be the _main_ problem you
will get or have..

Unfortunately nobody cares..
--
cu
Marco