about corals grow — led aquarium lights

When it comes to how corals grow, each category of animal requires its own unique lighting requirements, but all share one common trait; photosynthesis in order to survive. Just as plants convert sunlight to produce chlorophyll, marine animals survive similarly by converting light energy into “food”. Actually, this energy is consumed by zooxanthellae algae that produce by products that the corals need to survive; a true symbiotic relationship.

How Changes In Lighting Effects Corals

Coloration of coral polyps and tissues is dictated by these zooxanthellae. By differing the spectral output of our tank lighting we can actually influence the ultimate color/shading of our corals. How? Let’s say that we have been using a 5500K VHO fluorescent setup at 220 watts. We get that itch to spend money and help our tank and animals by installing a 250 watt metal halide with a 10,000K lamp. Aside from the aesthetics of the rippling light show these lamps provide, we have suddenly changed the frequency of light that all the animals in our system have grown accustomed to. I use the term “frequency” to describe the change in CRI or spectral output.

Often, the corals will shrink up, close their polyps, or otherwise show their displeasure at this sudden and drastic change in their energy source. It’s actually the billions of symbiotic algae that are recoiling, sending shock waves through their host and causing this rapid change in appearance. Within days, and sometimes even hours, the zooxanthellae will adapt to this new frequency and intensity by changing their absorption capabilities or their overall color. That’s right, the coral’s color is actually that of their hitch-hiking algae, adapting to the increases or decreases of ultraviolet and other energy-source factors.

Have you ever looked at a Tridacna clam from the top of the tank, then lower your gaze to a sideways view, only to be disappointed? Strange how dull the clam’s color appears from the side, while from above all those rich and vibrant colors seem to shout at the sky? Well, that’s the clam’s zooxanthellae algae, doing their thing, protecting the clam’s delicate tissues from sunburn!

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Indoor Pot Growing Tips

Indoor plants in pots bring color to your home when cared for properly. While the temperatures in the home are often suitable for plant growth, providing the right amount of light and other elements the plants need to thrive may take some effort. When properly cared for, potted plants usually thrive and provide greenery for many years.

Choosing Pots

  • Pots come in many sizes and materials. Choose a pot size that fits the plant you are growing. A too small pot inhibits growth while a too large pot may dry out too quickly. Common materials include plastic and clay. Plastic pots retain more moisture than clay and work best with plants that require moist soil. Use clay pots for succulents and cacti, as they require drier soil. Always ensure the pot you choose has at least once drainage hole in the bottom, otherwise the soil may become waterlogged.

Planting in Pots

  • Most plants grow well in soil-less potting mixtures, but you can also purchase potting soils formulated for the specific plant type you are growing. Do not block the drainage hole with pebbles before filling the pots, instead line the bottom with a coffee filter to prevent the soil from falling out. The coffee filter doesn’t inhibit water drainage like pebbles do. Leave a 2 inch space between the pot rim and soil surface. This space prevents the pot from overflowing when you water.

Watering Pots

  • Every plant has different water needs, so refer to the plant tag for the best irrigation practices for your plant. Generally, water potted plants when the top ½ to 1 inch of soil feels dry. Cactus and other desert plants may require watering only when the soil dries out completely. Water from the top of the pot until the excess drains from the bottom. This ensures that there is moisture in the root zone of the pot. Place pots on a drip tray to catch the draining water, and empty the drip tray after each irrigation.

Lights

  • Providing the proper amount of light is often the biggest challenge to growing potted plants indoors. Check the label for the specific light requirements of the plant. Low-light plants grow well with minimal light and thrive in most homes. Medium- and high-light plants must be placed near a window that receives six or more hours of light, or use indoor grow lights to provide the needed light for these plants.

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Fertilizer

  • Watering washes fertilizer from the soil, so it must be replenished regularly. A balanced soluble fertilizer, such as a 20-20-20 analysis, is suitable for most potted plants. Apply the fertilizer every two to four weeks when the plants are actively growing, usually from spring until fall for most varieties. Fertilizer amounts vary between brands, so follow manufacturer’s instructions on application rates and methods.

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