How Long Does It Take for Algae to Grow?

Algae is a group of eukaryotic organisms that survive by sunlight and carbon dioxide through photosynthesis. They can appear and grow in any water setting, such as aquariums, lakes, and pools.

Algae can be helpful in your aquarium, for example, providing a food source for some aquatic species like shrimp and snails. However, their overgrowth can cause some annoyances, such as making your aquarium more cluttered.

So how long does it take for algae to grow? What factors make algae grow faster? How to prevent them from growing?

As an aquarist, you need to answer these questions, and we will help you!

How Long Does It Take for Algae to Grow?

Algae usually grow for about three to four weeks

Algae grow for about 20 to 30 days (or three to four weeks). Their growth rate depends on several factors, such as nutrition, light, and temperature.

Fish Tank

Algae sometimes overgrowth in aquariums due to a lack of reasonable care. Too much sunlight or light can also lead to the rapid growth of algae in the fish tank.

So you should regularly clean your fish tank and check out for an imbalance in the tank water.


In ocean water, algae can grow up to 60 feet to reach the above surface, where there is a good amount of oxygen and a significant amount of sunlight.


Algae can thrive if the nutrients level in the water increase. Excessive sunlight amounts can also boost the algae growth in ponds.

In addition, other factors that can lead to algae appearing in ponds are mismanagement of fish food and lack of pond filtration.


Algae can grow in a pool if it does not get regularly checked and properly maintained. Also, imbalanced chlorine levels can lead to algae in a pool.

Algae can make your pool turn slippery and greenish, making it unsafe for your children.


Algae can appear on cement and concrete if they get wet for an extended period.

In addition, humid climates and temperatures are also factors that favor algae growth. They can seriously damage the concrete by discoloring it if not handled timely. The good news is that you can remove it by utilizing bleach.

Standing Water

The green algae, Chlorophyta, can appear in still water because of obtaining nutrients and direct sunlight. They will form a slimy/ goopy shape and get sticky when in contact.

What Are the Leading Causes of Algae Growing?


Light plays a crucial role in growing algae

Light plays the most crucial role in algae growth. Like other plants, algae include chlorophyll, meaning they need light for photosynthesis.

Like other plants, algae include chlorophyll, meaning they need light for photosynthesis. So you can slow them down by ensuring they don’t get enough light.

Also, the kinds of light are essential. Red and blue lights are most effective for green algae growth.

Nutrient Levels

The nutrient is also critical in deciding how fast algae can grow.

Algae need proper nutrients, such as phosphorus and nitrogen, for growth. That means a deficiency of these nutrients will slow down the growth of algae.

Ph Levels

ph level measuring

The pH level in the water can have a significant impact on algae growth. The ideal pH level for optimal growth in algae is between 8.2 and 8.7.

However, different algae types have different optimal pH levels. Hence, it is essential to know which algae you are referring to.


Temperature can influence algae growth rate. Algae will grow faster when temperatures are warmer.

So you must find the optimum temperature for particular algae if you want to inhibit or promote its growth.

Can You Keep Algae From Growing in Your Fish Tanks?

Regular Check

You should regularly check the water in your aquarium or pool for chlorine or other imbalances. Never keep a water condition for a long time without being adjusted.

Add Water Bodies

Adding water bodies, like water lilies or water hyacinths, can help as they will take up space and prevent algae from blooming as much.

Clean Up Frequently

Try to clean up your aquarium regularly, avoid too much sunlight and turn off the lights occasionally.

Filter the Water

You should filter the water frequently and try to maintain the water in circulation rather than standstill or steady.

Avoid Keeping the Unwanted Food

Avoid keeping unwanted food in the water. They will be a needed nutrient source for algae growth.


What Makes Algae Grow Faster?

Algae growth depends mainly on the following four factors:

  • Sunlight
  • warm water
  • Suitable pH
  • The right nutrition source

How to Maximize Algae Growth Rates?

Keep the temperature warm: Warm temperatures can boost algae growth. But they will die if the temperature is too hot.

Deliver plenty of light: Light is required for algae growth.

Be patient: It will take some time for the algae to grow from a small spore into a full-fledged plant. So don’t wait to see one-way results.

Maintain slightly alkaline or neutral pH levels: Algae favor slightly alkaline or neutral conditions for growth.

Give algae plenty of space: Algae need space to thrive, so ensure they get enough space in the pond or tank.

Will Algae Die if They Dry Out?

Yes, but they will return if you don’t kill the algae spores.

What Algae Growing Fastest?

Picochlorum Renovo features a doubling time of approximately 2.2 hours, which is about five to ten times faster than numerous algae.

Can I Grow Algae Without Sun?

Algae, like other plants, need sunlight to photosynthesize. That means they can’t live well without the sun.

Wrapping It Up

We’ve helped you answer the question, “How long does it Take for algae to grow?” Also, we have provided valuable information related to the same topic.

Although algae sometimes have many socio-economic values, having it overgrown in an aquarium can cause problems. You will know how to control algae growth through the above valuable information.

Thank you for reading!