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Coral Competition - Turf Wars in Coral Reef Tanks

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Coral Competition - Turf Wars in Coral Reef Tanks

Lucia Galvan's Brain Star Coral

Brain Star Coral

Lucia Galvan
In the wild, coral reefs are in a constant slow motion turf war. Both hard and soft corals have the ability (barring outside influences) to cover up to 85% of the substrate on a reef, being quite successful at defeating invading organisms, such as algae. This leaves the battle for a majority of the reef real estate to the corals, which deploy both offensive and defensive weapons in order to survive and propagate.

The same battle for turf can be going on in your reef tank, too. A majority of the elements involved in reef survival are concentrated in a reef aquarium. By planning coral placements in your tank and being aware of developing turf conflicts, a majority of problems can avoided or controlled.

Coral Toxicity to Fish shows the potential affects of coral toxins on fish while Signs of Coral Competition shows what the indications are that your corals may be competing for turf in your tank.

Corals acquire and maintain space on a reef by:

  • Reproducing rapidly.
  • Competing for available food.
  • Having offensive and defensive weapons.
  • Having the ability to sustain damage and still continue to reproduce.
There is a price for doing battle on the reef: The energy spent on both offense and defense uses precious resources that could otherwise be spent on growth and reproduction.

It has been estimated that, on the reef, between 22% and 38% of all coral colonies are engaged in battle or are within range to engage. Fortunately, more corals are passive than aggressive. Unfortunately, a good defense does not always win. Most corals must be aggressive in order to survive. Four levels of engagement have been proposed (Rinkevich and Loya, 1985): See the Four Levels of Engagement

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