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March 6, 2026 in Reef Aquariums

When One Coral Takes Over: A Lesson From Nature for Reef Aquariums

by Tom Lang

If you’ve kept a reef aquarium long enough, you eventually notice something interesting: your tank begins behaving a lot like a natural coral reef.

On a wild reef, empty rock rarely stays empty for long. Life moves in. Larvae settle. Algae grows. Corals expand. Over time, the available real estate gets claimed.

The same thing happens in our reef aquariums.

When there are bare patches of live rock in a reef tank, those spaces won’t stay open indefinitely. If one coral species happens to be thriving—especially a fast-growing one—it will eventually expand, reproduce, and cover those areas. Before long, the tank can become dominated by that single coral (or even anemone!).

Ironically, the species that takes over is not always the one we originally envisioned as the star of the aquarium. It might be a hardy soft coral or a fast-growing encrusting species that isn’t particularly colorful or dramatic. But in reef ecology, success often comes down to growth rate and persistence, not beauty.

Natural reefs show the same pattern. When conditions favor one coral species, it can become dominant across large areas until something changes the balance.

In the aquarium, however, we have an advantage that the ocean does not: we can plan.

One of the simplest ways to maintain diversity in a reef tank is to think in terms of a coral budget. Instead of leaving open rock to chance, decide how many corals you want the system to hold and gradually fill those spaces with intention.

A helpful rule of thumb is simple: add one coral per month. After the first year, that’s twelve corals established in your reef. After the second year, twenty-four. After the third year, thirty-six. Voila! Without rushing the system or overcrowding the rockwork, you’ve gradually built a diverse reef community.

That slow, steady approach accomplishes several things. It allows the aquarium’s biological system to adjust to each new addition, gives the aquarist time to choose species carefully, and prevents a single opportunistic coral from monopolizing the rockwork.

Over time, those monthly additions begin to shape the aquarium into something far more interesting than a monoculture. The rocks become a mosaic of textures and colors—branching corals, encrusting species, soft movement, and stony structure—much closer to the diversity we admire on natural reefs.

Reef aquariums reward patience. Left unattended, nature will fill the empty spaces on its own terms. But with a little planning—and a modest coral budget—we can guide that process toward a healthier, more diverse, and more beautiful reef.

And in the end, that’s what reef keeping is all about: learning how natural systems work, and then working with them rather than against them. 🐠

June 4, 2022 in Reef Aquariums

Reef Aquarium Dosing

by Tom Lang

We are often contacted about living reef aquariums that are not doing well. Either the corals are not living long or algae is taking over.

The one maintenance step that is almost always missed is regular water testing.

New clients will often say, “that’s what I have you for!” And we respond that levels of Alkalinity and Calcium necessary for coral survival are usually depleted within a few days after our service visits and waiting to supplement these minerals until our next service visit can be very stressful for your corals. Coral reefs are naturally stable environments and sudden swings in chemistry are just not handled well by many desirable corals. We totally understand that paying us to come out weekly just to test and dose basic Alkalinity and Calcium is prohibitive for most budgets and this is why we often recommend our reef aquarium clients keeping stony corals dose Alkalinity and Calcium, sometimes daily, in between our visits.

This may sound daunting, but if you think about it, you’re feeding your fish every day anyway and you’ll just need to add one more routine that takes less than a minute a day that will keep your corals alive and thriving. And if you skip a day or even two, it’s still better than not dosing at all.

When we visit all of our reef aquarium clients, we test Alkalinity, Calcium, Nitrate and Phosphate levels every time. We also test Magnesium levels every so often (it usually doesn’t change much) and we record these results in your client file.

When we test Nitrate and Phosphate, we are looking for trends that can spell trouble, but controlling Nitrate and Phosphate usually requires longer term actions. However, with Alkalinity and Calcium, when we compare our readings from today with those from our last visit, we can calculate your specific reef aquarium’s Alkalinity and Calcium usage by dividing the differences by the number of days between our visits. We can then let you know how many ounces (usually 1 oz per pump) or milliliters (using a syringe) of each Alkalinity and Calcium product you’ll need to add daily to keep up with your own aquarium’s specific demand (every aquarium has different demands just like every car varies in how much fuel it needs per mile).

We can recommend customized doses of literally dozens of brands on the market of two-part solutions or even powdered products you mix with RO (Reverse Osmosis) water yourself to save on shipping costs. They all work. The easiest ones are the liquid solutions and for a smaller reef, quart size bottles are usually fine whereas gallon jugs last longer for our larger reefs with high Alkalinity and Calcium demands. Keep in mind, we tend to be conservative when recommending dosing amounts because we don’t want to overdose – which can be worse than temporarily depleted levels.

Lastly, remember that the longer you go without testing, the more likely it is that the dosing will either be too much or too little and levels will wander either up or down. Going a month without testing is really a crapshoot, but some of our clients do get lucky. This “luck” is usually because their reef aquarium is very consistent and stable in its Alkalinity and Calcium demands due to no new corals being added or removed.  That is why it’s critical especially during those times when you’re adding new corals to a new or even established reef aquarium, that Alkalinity and Calcium be tested frequently (3 – 7 days a week) so that your water is always the best it can be in terms of the right balance of these essential minerals.

July 8, 2017 in Reef Aquariums

We are the Reef Aquarium Hobbyist’s Go-To Service Company

by Tom Lang

As a dedicated reef aquarium hobbyist, you have a lot invested in your tank, life support system and livestock – A LOT of cash, sweat and passion. Maybe you have an extra-special rare fish, a one-of-a-kind chalice coral, a Montipora that’s grown spectacularly or a rack full of high-end Acropora frags.

Now that it’s time for a much-deserved vacation, you feel like you’re a slave to your tank. You even consider staying home while your family goes on without you. This is totally unnecessary if you live in the Fresno/Clovis metropolitan area.

Our professional aquarists will come to your home or office and take care of all your aquarium’s needs while you’re away.

Our staff will feed your fish, top-off your RO water and even test and adjust your aquarium’s chemical parameters whether you’re sipping a fruity drink with an umbrella in a bure in Tahiti or visiting your brother in Tehama.

And even if your 5 year old blows up your tank and electrical throughout your whole house when you are diving in Bora Bora, you can rest assured that we’ve seen it and done it all many, many times before and that your reef aquarium will be in great shape when you return.

Contact Us today and we’ll set everything up so you can travel the world stress-free!