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CO2 injection adds dissolved carbon dioxide to aquarium water so plants can photosynthesise at the rate their light and nutrients already allow. In a planted tank carbon is usually the factor running out first, so a steady supply speeds growth, fills leaves out and leaves algae less room. A working setup needs a regulator, a diffuser and a way to read the level in the water.

A drop checker is a simple aquarium tool used to monitor CO₂ levels and help keep planted tanks stable. Before buying one, most aquarists want to know how it works, how accurate it is, where to place it, and whether it’s really necessary. This guide answers the most common questions buyers ask first so you can choose and use a drop checker with confidence.

Pogostemon stellatus is one great addition to a colourful planted tank. Its thin, elongated, bright green leaves with a purple underside will more than hold its own in the company of such stunning stem plants like Ludwigia ‘Pantanal' and Rotala Macrandra. It is a medium grower and would happily show its colours when all requirements are met. Out of all stem plants, though, this would be one of a few that will immediately show that it is not happy in the tank. The top will start to change colour, and the leaves will begin to wither in a few days once one of its needs is lacking. 

Understanding the basics of planted tank maintenance is necessary for the aquarium hobby. We must know that fish and other livestock inhabiting a planted tank will produce substances that contaminate the aquarium. Fish and other fauna produce toxic ammonia through excrement and respiration. Additionally, aquarium plants create this through decomposing leaves. A milligram of this poisonous substance per litre of water would easily wipe out all the tank's inhabitants. Nitrites, Nitrates, and other elements will also be present in the aquarium water, which could equally be as lethal in the right amounts. Understanding the process surrounding removing these toxic nitrogen compounds and fish waste from the water should be at the top of the list regarding aquarium maintenance.