Setting aquarium lighting: start with a consistent rhythm

A new aquarium light may offer many settings. It is tempting to experiment immediately with brightness, colour and schedules. Establish a simple baseline first and write it down. You will then know what changed and can judge adjustments more clearly.

Start with the manual and your plant list

Record the light model, tank dimensions and plants. Check the mounting and intended application in the manual. Ask which setting suits your setup; advice for another tank may not fit your water depth or planting.

Use a predictable schedule

Tropica suggests six hours of light daily as a starting point during the first weeks of a new planted aquarium. This belongs to its startup guidance, rather than being a fixed rule for every tank. Read Tropica’s growing-in guide and adapt the setting to your situation.

Choose a timer you understand and check that it actually follows the programmed schedule. Record both duration and brightness. Increasing lighting time and intensity are two different adjustments; avoid changing both without noticing.

Keep a simple lighting record

Use one weekly entry with start and finish times, brightness and a photograph. Describe observations without immediately assigning a cause: “green film on the front glass” or “new leaves on the rear plant”, for example. Include recent maintenance so that someone advising you can see the whole picture.

Check before buying another light

• Is my present schedule clear and consistent?
• Do I know the requirements of my chosen plants?
• Does the replacement physically fit the aquarium and cover?
• Can I find and restore settings easily?

Keep a photograph of the baseline settings. Before making an adjustment, decide what you want to assess and when you will look again. This builds knowledge of your own aquarium instead of starting over each time.