"JeffinMS" wrote in
:

problems I might come across with not changing water for long periods?

The build-up of organic and inorganic wastes; dissolved in the water table
as well as trapped in the substrate and in your filter.

These byproducts will gradually increase the stress level of your fish and
drop your pH potentially making your fish more susceptible to infection or
shock.

The accumulation of these wastes can eventually impact the efficiency of
your filter too possibly leading to an ammonia/ammonium or nitrite spike
which spells toxic shock/stress for your livestock.