Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Everything that goes in the tank contributes to TDS from tapwater,fish food,fish poo,fertilizers,water conditioners, some substrates,etc.
200ppm would not be too bad ,but some species of fishes/inverts may appreciate lower number.
Good maint routine (ie) water changes ,not overstocking,overfeeding,regular cleaning of filters will help greatly.