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Don't leave the lights on too long


A common cause of algae. Phosphate, ammonium and nitrate aside, if you experience a lot of algae, you may simply have the light on for too long in your aquarium.

Lighting is developed to be brighter than ever before, and is aimed at encouraging a particular response from your plants or corals, or to enhance your fish colours.

Plants and corals typically need the light on for around 10 hours per day, but only really need full spectrum (all your lights) for six hours per day. Anything more than this and it may cause algae.

If you are using bright lighting for plants, make sure that you have sufficient plants to out-compete any algae.

This can mean 70% coverage in your tank. One or two bunches of plants, plus 10 hours of light daily, mean algae, so either increase their number or use plastic plants instead.

Fish aren’t really bothered about lighting, and most would prefer it subdued. If you don’t have live plants or corals, cut the lighting right down so that you just have it on when you are at home.

Four or less hours per day will make it difficult for any algae to grow, and the fish will be fine in ambient room light at all other times. Never leave the light on 24/7.

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