Analyzing my aquarium total dissolved solids (TDS) a neat trend can be noticed. A water change was completed on the 9th which resulted in a dramatic drop in TDS but over time the TDS had risen back to its previous levels. As this the aquarium has an open top, water will evaporate and lead to an increased solids concentration. A water top up was completed on the 8th and there was a drop in TDS related to that as well.
