Why is my Macroalgae not Growing?

Why is my Macroalgae not Growing?

In some instances, other algae can reduce the growth rate of macros. This is due to competition. Suppose you have everything in your system just right for algae growth—a virtual algae paradise. Suppose also that there are other, less desirable forms of algae present. These too will proliferate aggressively. They might, in fact, grow a lot faster than your macroalgae. Planktonic forms can really discolor the water, stealing much of the available light. Benthic forms (known as epiphytes) can actually grow on top of the macros, blocking them from light and water flow. What to do?

In these cases, it’s virtually impossible to physically remove the offending algae. And, any effort to poison them would likely harm the macros as well. Here, the best option is ultraviolet sterilization (to control unwanted plankton blooms) and small herbivores such as hermit crabs (to control epiphytes). Be sure that your refugium clean-up crew consists of species that will consume only the bad algae and ignore the good. Moreover, purchasing only “clean” macros is a great way to start, since you’ll be bringing far less of this bad stuff home with you!

No more micro macros

Whether you use macroalgae for nutrient export or simply because you find them to be beautiful, it can be frustrating when they won’t grow. Fortunately, there are just a few things to look at as you improve their cultural environment. With the right lighting, adequate water chemistry, lots of space and few competitors, your macros will grow to be huge, lush and vibrant!
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