How Often to Change Water in a Reef Tank (Schedule)

Water changes are one of the most practical maintenance tasks in a reef aquarium: they dilute dissolved waste, refresh trace elements, and help stabilize key water parameters. But the right frequency depends on how much “work” your tank is doing—how heavily it’s stocked, how strong the filtration is, and what your test results show.

Below is a proven, step-by-step schedule you can follow in most reef setups, with guidance on when to speed up or slow down.

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Mixed Reef vs SPS-Dominant Tanks: Lighting Needs

Mixed Reef vs SPS-Dominant Tanks: Lighting Needs Choosing between a mixed reef and an SPS-dominant system is less about “better” and more about whether you want flexibility and variety—or maximum coral growth potential with tighter control. Lighting is usually the deciding factor because SPS generally demands higher light and more stable conditions than many other reef corals. Below is a practical comparison of both approaches, with the pros and cons that matter most, plus the lighting needs reef keepers commonly p ... Read more »

Me & Velvet Sickness on the Reef: Safe Treatments

Me & Velvet Sickness on the Reef: Safe Treatments White spots, mucus coating, rapid weight loss: When Ich or Velvet disease (velvet disease) appear in a reef aquarium, every hour counts. Both diseases are caused by parasites that infest fish – while corals and invertebrates can be affected to varying degrees depending on the treatment. Therefore, it's crucial not only to know "what helps," but also "what is demonstrably safest for the reef." The following overview categorizes the typical symptoms, explai ... Read more »

Sustainable Coral Farming: How Aquaculture Is Changing the Hobby

Sustainable Coral Farming: How Aquaculture Is Changing the Hobby For years, coral reef hobbyists have faced a tradeoff: the desire to keep vibrant reef life at home, versus the environmental cost of extracting wild colonies. Increasingly, that equation is changing as sustainable coral farming expands—and as aquaculture becomes the industry standard for many popular species. Rather than taking corals from reefs, aquaculture nurseries grow corals in controlled systems, then supply fragments to hobbyists and retailers. The approach is gaining mo ... Read more »

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